use test;
Test read-locality of READ-BACKUP
create table test.t1 (a int primary key,
b int,
c int,
d int,
unique(b) using hash,
key(c),
key(a,c))
comment="NDB_TABLE=READ_BACKUP=1"
  engine=ndb;
Warnings:
Warning	1121	Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
create table test.t2 (a int primary key,
b int,
c int,
d text,
unique(b) using hash,
key(c))
comment="NDB_TABLE=READ_BACKUP=1"
  engine=ndb;
Warnings:
Warning	1121	Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
select id into @t1_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t1';
select id into @t1ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t1_id and type = 3;
select id into @t2_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t2';
select id into @t2ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and type = 3;
select id into @t2bt_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and fq_name like 'test/def/NDB$BLOB%';
Put some data in.
Make it more interesting for joining
update test.t1 set c=c+1, d=d+1;
select count(distinct node_id) into @nodes
from ndbinfo.ndb$membership where group_id < 0xFFFFFF00;
Check replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1'
   and fragment_num=0;
count(distinct node_id)
2
Check nodes with table data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1';
count(distinct node_id)
2
Check UI replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with UI data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id;
count(distinct node_id)
2
Put some data in.
insert into test.t2 select a,b,c,repeat('BJC',300) from test.t1;
Check blob table replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with blob data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id;
count(distinct node_id)
2
set @partitions = 'PARTITION p2 VALUES IN (2)';
set @partitions = concat(@partitions,',PARTITION p1 VALUES IN (1)');
set @@new = 1;
create table hints (i int primary key) engine=ndb partition by list(i) (PARTITION p2 VALUES IN (2),PARTITION p1 VALUES IN (1));
insert into hints values (2);
Hint node by 2 of 2
Tests on T1 (!Blobs)
Test some basic NdbApi
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	0	24
PK lookups
explain select * from test.t1 where t1.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`a` = 6)
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	16
1	LOCAL_READS	3
2	READS	5
2	LOCAL_READS	3
3	READS	1
3	LOCAL_READS	0
4	READS	4
4	LOCAL_READS	0
5	READS	4
5	LOCAL_READS	0
6	READS	6
6	LOCAL_READS	0
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	40	24
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	16
1	LOCAL_READS	3
2	READS	45
2	LOCAL_READS	43
3	READS	1
3	LOCAL_READS	0
4	READS	4
4	LOCAL_READS	0
5	READS	4
5	LOCAL_READS	0
6	READS	6
6	LOCAL_READS	0
UI lookups
explain select * from test.t1 where t1.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	80	24
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	16
1	LOCAL_READS	3
2	READS	125
2	LOCAL_READS	123
3	READS	1
3	LOCAL_READS	0
4	READS	4
4	LOCAL_READS	0
5	READS	4
5	LOCAL_READS	0
6	READS	6
6	LOCAL_READS	0
OI scan
explain select * from test.t1 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t1`.`c` > 6); Using MRR
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	80	24
Table scan
explain select * from test.t1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	80	32
Test pushed queries (SPJ)
Pushed pk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	160	40
Pushed uk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	120	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	239	40
Pushed uk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	160	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	319	40
Pushed pk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	200	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	398	40
Pushed scan originating sub-lookups
Table scan to get a.d, feeding pk lookups of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`a` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	200	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	438	48
Pushed scan originating sub-lookups
Table scan to get a.d, feeding uk lookups of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`b` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	240	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	477	56
Pushed scan originating sub-scans
Range scan on a.a > 10 getting a.d, feeding range scans on b.c = a.d
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	range	PRIMARY,a	PRIMARY	4	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition ((`test`.`a`.`a` > 10) and (`test`.`a`.`d` is not null)); Using MRR
1	SIMPLE	b	#	ref	c	c	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`c` = `test`.`a`.`d`) and (`test`.`a`.`a` > 10))
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	240	0
test/def/t1	sys/def/10/c	Ordered index	2	0	16
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	477	56
Tests on T2 (Blobs)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	0	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	16
1	LOCAL_READS	3
2	READS	285
2	LOCAL_READS	283
3	READS	1
3	LOCAL_READS	0
4	READS	4
4	LOCAL_READS	0
5	READS	4
5	LOCAL_READS	0
6	READS	6
6	LOCAL_READS	0
Test some basic NdbApi
explain select * from test.t2 where t2.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	eq_ref	PRIMARY	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`a` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	40	0
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	80	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	16
1	LOCAL_READS	3
2	READS	367
2	LOCAL_READS	364
3	READS	1
3	LOCAL_READS	0
4	READS	4
4	LOCAL_READS	0
5	READS	4
5	LOCAL_READS	0
6	READS	6
6	LOCAL_READS	0
UI lookups
explain select * from test.t2 where t2.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	80	0
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	0
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	160	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	16
1	LOCAL_READS	3
2	READS	567
2	LOCAL_READS	564
3	READS	1
3	LOCAL_READS	0
4	READS	4
4	LOCAL_READS	0
5	READS	4
5	LOCAL_READS	0
6	READS	6
6	LOCAL_READS	0
OI scan
explain select * from test.t2 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t2`.`c` > 6)
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	115	0
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	160	12
Table scan
explain select * from test.t2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	155	0
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	160	20
drop table hints;
delete from t1;
delete from t2;
drop table test.t1;
drop table test.t2;
Test read-locality of FULLY-REPLICATED
create table test.t1 (a int primary key,
b int,
c int,
d int,
unique(b) using hash,
key(c),
key(a,c))
comment="NDB_TABLE=FULLY_REPLICATED=1"
   engine=ndb;
Warnings:
Warning	1121	Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
create table test.t2 (a int primary key,
b int,
c int,
d text,
unique(b) using hash,
key(c))
comment="NDB_TABLE=FULLY_REPLICATED=1"
  engine=ndb;
Warnings:
Warning	1121	Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
select id into @t1_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t1';
select id into @t1ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t1_id and type = 3;
select id into @t2_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t2';
select id into @t2ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and type = 3;
select id into @t2bt_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and fq_name like 'test/def/NDB$BLOB%';
Put some data in.
Make it more interesting for joining
update test.t1 set c=c+1, d=d+1;
select count(distinct node_id) into @nodes
from ndbinfo.ndb$membership where group_id < 0xFFFFFF00;
Check replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1'
   and fragment_num=0;
count(distinct node_id)
2
Check nodes with table data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1';
count(distinct node_id)
2
Check UI replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with UI data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id;
count(distinct node_id)
2
Put some data in.
insert into test.t2 select a,b,c,repeat('BJC',300) from test.t1;
Check blob table replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with blob data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id;
count(distinct node_id)
2
set @partitions = 'PARTITION p2 VALUES IN (2)';
set @partitions = concat(@partitions,',PARTITION p1 VALUES IN (1)');
set @@new = 1;
create table hints (i int primary key) engine=ndb partition by list(i) (PARTITION p2 VALUES IN (2),PARTITION p1 VALUES IN (1));
insert into hints values (2);
Hint node by 2 of 2
Tests on T1 (!Blobs)
Test some basic NdbApi
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	0	24
PK lookups
explain select * from test.t1 where t1.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`a` = 6)
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	41
1	LOCAL_READS	15
2	READS	580
2	LOCAL_READS	571
3	READS	9
3	LOCAL_READS	0
4	READS	57
4	LOCAL_READS	0
5	READS	12
5	LOCAL_READS	0
6	READS	96
6	LOCAL_READS	0
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	40	24
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	41
1	LOCAL_READS	15
2	READS	620
2	LOCAL_READS	611
3	READS	9
3	LOCAL_READS	0
4	READS	57
4	LOCAL_READS	0
5	READS	12
5	LOCAL_READS	0
6	READS	96
6	LOCAL_READS	0
UI lookups
explain select * from test.t1 where t1.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	80	24
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	41
1	LOCAL_READS	15
2	READS	700
2	LOCAL_READS	691
3	READS	9
3	LOCAL_READS	0
4	READS	57
4	LOCAL_READS	0
5	READS	12
5	LOCAL_READS	0
6	READS	96
6	LOCAL_READS	0
OI scan
explain select * from test.t1 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t1`.`c` > 6); Using MRR
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	80	24
Table scan
explain select * from test.t1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	80	32
Test pushed queries (SPJ)
Pushed pk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	40	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	160	40
Pushed uk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	120	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	239	40
Pushed uk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	160	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	319	40
Pushed pk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	200	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	398	40
Pushed scan originating sub-lookups
Table scan to get a.d, feeding pk lookups of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`a` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	200	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	438	48
Pushed scan originating sub-lookups
Table scan to get a.d, feeding uk lookups of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`b` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	240	0
test/def/t1	sys/def/10/c	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	477	56
Pushed scan originating sub-scans
Range scan on a.a > 10 getting a.d, feeding range scans on b.c = a.d
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	range	PRIMARY,a	PRIMARY	4	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition ((`test`.`a`.`a` > 10) and (`test`.`a`.`d` is not null)); Using MRR
1	SIMPLE	b	#	ref	c	c	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`c` = `test`.`a`.`d`) and (`test`.`a`.`a` > 10))
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	2	240	0
test/def/t1	sys/def/10/c	Ordered index	2	0	16
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	477	56
Tests on T2 (Blobs)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	0	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	41
1	LOCAL_READS	15
2	READS	860
2	LOCAL_READS	851
3	READS	9
3	LOCAL_READS	0
4	READS	57
4	LOCAL_READS	0
5	READS	12
5	LOCAL_READS	0
6	READS	96
6	LOCAL_READS	0
Test some basic NdbApi
explain select * from test.t2 where t2.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	eq_ref	PRIMARY	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`a` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	40	0
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	80	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	41
1	LOCAL_READS	15
2	READS	942
2	LOCAL_READS	931
3	READS	9
3	LOCAL_READS	0
4	READS	57
4	LOCAL_READS	0
5	READS	12
5	LOCAL_READS	0
6	READS	96
6	LOCAL_READS	0
UI lookups
explain select * from test.t2 where t2.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	80	0
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	0
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	160	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	41
1	LOCAL_READS	15
2	READS	1142
2	LOCAL_READS	1131
3	READS	9
3	LOCAL_READS	0
4	READS	57
4	LOCAL_READS	0
5	READS	12
5	LOCAL_READS	0
6	READS	96
6	LOCAL_READS	0
OI scan
explain select * from test.t2 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t2`.`c` > 6)
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	115	0
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	160	12
Table scan
explain select * from test.t2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	155	0
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	160	20
drop table hints;
delete from t1;
delete from t2;
Test read-locality of FULLY-REPLICATED with 2 node groups
Nodegroup 1 created
alter table t1 algorithm=inplace, reorganize partition;
alter table t2 algorithm=inplace, reorganize partition;
select id into @t1_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t1';
select id into @t1ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t1_id and type = 3;
select id into @t2_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t2';
select id into @t2ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and type = 3;
select id into @t2bt_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and fq_name like 'test/def/NDB$BLOB%';
Put some data in.
Make it more interesting for joining
update test.t1 set c=c+1, d=d+1;
select count(distinct node_id) into @nodes
from ndbinfo.ndb$membership where group_id < 0xFFFFFF00;
Check replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1'
   and fragment_num=0;
count(distinct node_id)
2
Check nodes with table data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1';
count(distinct node_id)
4
Check UI replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with UI data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id;
count(distinct node_id)
4
Put some data in.
insert into test.t2 select a,b,c,repeat('BJC',300) from test.t1;
Check blob table replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with blob data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id;
count(distinct node_id)
4
set @partitions = 'PARTITION p4 VALUES IN (4)';
set @partitions = concat(@partitions,',PARTITION p3 VALUES IN (3)');
set @partitions = concat(@partitions,',PARTITION p2 VALUES IN (2)');
set @partitions = concat(@partitions,',PARTITION p1 VALUES IN (1)');
set @@new = 1;
create table hints (i int primary key) engine=ndb partition by list(i) (PARTITION p4 VALUES IN (4),PARTITION p3 VALUES IN (3),PARTITION p2 VALUES IN (2),PARTITION p1 VALUES IN (1));
insert into hints values (4);
Hint node by 4 of 4
Tests on T1 (!Blobs)
Test some basic NdbApi
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	240	8
test/def/t1	sys/def/10/c	Ordered index	2	0	16
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	477	88
PK lookups
explain select * from test.t1 where t1.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`a` = 6)
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	51
1	LOCAL_READS	22
2	READS	1270
2	LOCAL_READS	1253
3	READS	12
3	LOCAL_READS	0
4	READS	60
4	LOCAL_READS	0
5	READS	15
5	LOCAL_READS	0
6	READS	99
6	LOCAL_READS	0
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	240	8
test/def/t1	sys/def/10/c	Ordered index	2	0	16
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	517	88
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	51
1	LOCAL_READS	22
2	READS	1310
2	LOCAL_READS	1293
3	READS	12
3	LOCAL_READS	0
4	READS	60
4	LOCAL_READS	0
5	READS	15
5	LOCAL_READS	0
6	READS	99
6	LOCAL_READS	0
UI lookups
explain select * from test.t1 where t1.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	280	8
test/def/t1	sys/def/10/c	Ordered index	2	0	16
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	557	88
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	51
1	LOCAL_READS	22
2	READS	1390
2	LOCAL_READS	1373
3	READS	12
3	LOCAL_READS	0
4	READS	60
4	LOCAL_READS	0
5	READS	15
5	LOCAL_READS	0
6	READS	99
6	LOCAL_READS	0
OI scan
explain select * from test.t1 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t1`.`c` > 6); Using MRR
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	280	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	557	88
Table scan
explain select * from test.t1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	280	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	557	96
Test pushed queries (SPJ)
Pushed pk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	280	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	637	104
Pushed uk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	360	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	716	104
Pushed uk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	400	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	796	104
Pushed pk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	440	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	875	104
Pushed scan originating sub-lookups
Table scan to get a.d, feeding pk lookups of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`a` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	440	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	915	112
Pushed scan originating sub-lookups
Table scan to get a.d, feeding uk lookups of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`b` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	480	8
test/def/t1	sys/def/10/c	Ordered index	2	0	24
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	8
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	954	120
Pushed scan originating sub-scans
Range scan on a.a > 10 getting a.d, feeding range scans on b.c = a.d
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	range	PRIMARY,a	PRIMARY	4	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition ((`test`.`a`.`a` > 10) and (`test`.`a`.`d` is not null)); Using MRR
1	SIMPLE	b	#	ref	c	c	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`c` = `test`.`a`.`d`) and (`test`.`a`.`a` > 10))
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/10/b$unique	Unique hash index	1	0	8
test/def/t1	sys/def/10/b$unique	Unique hash index	2	480	8
test/def/t1	sys/def/10/c	Ordered index	2	0	32
test/def/t1	sys/def/10/PRIMARY	Ordered index	2	0	16
NULL	test/def/t1	User table	1	0	24
NULL	test/def/t1	User table	2	954	120
Tests on T2 (Blobs)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	1	0	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	155	8
test/def/t2	sys/def/15/b$unique	Unique hash index	1	0	8
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	8
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	16
NULL	test/def/t2	User table	2	200	40
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	51
1	LOCAL_READS	22
2	READS	1550
2	LOCAL_READS	1533
3	READS	12
3	LOCAL_READS	0
4	READS	60
4	LOCAL_READS	0
5	READS	15
5	LOCAL_READS	0
6	READS	99
6	LOCAL_READS	0
Test some basic NdbApi
explain select * from test.t2 where t2.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	eq_ref	PRIMARY	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`a` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	1	0	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	177	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	4	18	0
test/def/t2	sys/def/15/b$unique	Unique hash index	1	0	8
test/def/t2	sys/def/15/b$unique	Unique hash index	2	80	8
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	16
NULL	test/def/t2	User table	2	244	40
NULL	test/def/t2	User table	4	36	0
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	51
1	LOCAL_READS	22
2	READS	1594
2	LOCAL_READS	1577
3	READS	12
3	LOCAL_READS	0
4	READS	96
4	LOCAL_READS	36
5	READS	15
5	LOCAL_READS	0
6	READS	99
6	LOCAL_READS	0
UI lookups
explain select * from test.t2 where t2.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	1	0	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	197	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	4	38	0
test/def/t2	sys/def/15/b$unique	Unique hash index	1	0	8
test/def/t2	sys/def/15/b$unique	Unique hash index	2	120	8
test/def/t2	sys/def/15/b$unique	Unique hash index	4	40	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
NULL	test/def/t2	User table	1	0	16
NULL	test/def/t2	User table	2	284	40
NULL	test/def/t2	User table	4	76	0
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	51
1	LOCAL_READS	22
2	READS	1694
2	LOCAL_READS	1677
3	READS	12
3	LOCAL_READS	0
4	READS	196
4	LOCAL_READS	136
5	READS	15
5	LOCAL_READS	0
6	READS	99
6	LOCAL_READS	0
OI scan
explain select * from test.t2 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t2`.`c` > 6)
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	1	0	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	197	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	4	73	0
test/def/t2	sys/def/15/b$unique	Unique hash index	1	0	8
test/def/t2	sys/def/15/b$unique	Unique hash index	2	120	8
test/def/t2	sys/def/15/b$unique	Unique hash index	4	40	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
test/def/t2	sys/def/15/c	Ordered index	4	0	8
NULL	test/def/t2	User table	1	0	16
NULL	test/def/t2	User table	2	284	40
NULL	test/def/t2	User table	4	76	0
Table scan
explain select * from test.t2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_15_3	User table	1	0	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	2	237	8
test/def/t2	test/def/NDB$BLOB_15_3	User table	4	73	0
test/def/t2	sys/def/15/b$unique	Unique hash index	1	0	8
test/def/t2	sys/def/15/b$unique	Unique hash index	2	120	8
test/def/t2	sys/def/15/b$unique	Unique hash index	4	40	0
test/def/t2	sys/def/15/c	Ordered index	2	0	8
test/def/t2	sys/def/15/c	Ordered index	4	0	8
NULL	test/def/t2	User table	1	0	16
NULL	test/def/t2	User table	2	284	48
NULL	test/def/t2	User table	4	76	0
drop table hints;
delete from t1;
delete from t2;
drop table test.t1;
drop table test.t2;
Test read-locality of READ-BACKUP with 3 node groups
Nodegroup 2 created
create table test.t1 (a int primary key,
b int,
c int,
d int,
unique(b) using hash,
key(c),
key(a,c))
comment="NDB_TABLE=READ_BACKUP=1"
  engine=ndb;
Warnings:
Warning	1121	Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
create table test.t2 (a int primary key,
b int,
c int,
d text,
unique(b) using hash,
key(c))
comment="NDB_TABLE=READ_BACKUP=1"
  engine=ndb;
Warnings:
Warning	1121	Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan
select id into @t1_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t1';
select id into @t1ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t1_id and type = 3;
select id into @t2_id from ndbinfo.ndb$dict_obj_info where fq_name = 'test/def/t2';
select id into @t2ui_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and type = 3;
select id into @t2bt_id from ndbinfo.ndb$dict_obj_info where parent_obj_id = @t2_id and fq_name like 'test/def/NDB$BLOB%';
Put some data in.
Make it more interesting for joining
update test.t1 set c=c+1, d=d+1;
select count(distinct node_id) into @nodes
from ndbinfo.ndb$membership where group_id < 0xFFFFFF00;
Check replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1'
   and fragment_num=0;
count(distinct node_id)
2
Check nodes with table data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where fq_name='test/def/t1';
count(distinct node_id)
6
Check UI replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with UI data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t1ui_id;
count(distinct node_id)
6
Put some data in.
insert into test.t2 select a,b,c,repeat('BJC',300) from test.t1;
Check blob table replicas
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id
and fragment_num=0;
count(distinct node_id)
2
Check nodes with blob data
select count(distinct node_id)
from ndbinfo.operations_per_fragment
where table_id = @t2bt_id;
count(distinct node_id)
6
set @partitions = 'PARTITION p6 VALUES IN (6)';
set @partitions = concat(@partitions,',PARTITION p5 VALUES IN (5)');
set @partitions = concat(@partitions,',PARTITION p4 VALUES IN (4)');
set @partitions = concat(@partitions,',PARTITION p3 VALUES IN (3)');
set @partitions = concat(@partitions,',PARTITION p2 VALUES IN (2)');
set @partitions = concat(@partitions,',PARTITION p1 VALUES IN (1)');
set @@new = 1;
create table hints (i int primary key) engine=ndb partition by list(i) (PARTITION p6 VALUES IN (6),PARTITION p5 VALUES IN (5),PARTITION p4 VALUES IN (4),PARTITION p3 VALUES IN (3),PARTITION p2 VALUES IN (2),PARTITION p1 VALUES IN (1));
insert into hints values (6);
Hint node by 6 of 6
Tests on T1 (!Blobs)
Test some basic NdbApi
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	0	24
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	0	24
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	0	24
PK lookups
explain select * from test.t1 where t1.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`a` = 6)
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	75
1	LOCAL_READS	41
2	READS	1787
2	LOCAL_READS	1760
3	READS	21
3	LOCAL_READS	0
4	READS	239
4	LOCAL_READS	171
5	READS	23
5	LOCAL_READS	0
6	READS	119
6	LOCAL_READS	0
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	11	24
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	16	24
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	13	24
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	75
1	LOCAL_READS	41
2	READS	1798
2	LOCAL_READS	1771
3	READS	21
3	LOCAL_READS	0
4	READS	255
4	LOCAL_READS	187
5	READS	23
5	LOCAL_READS	0
6	READS	132
6	LOCAL_READS	13
UI lookups
explain select * from test.t1 where t1.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	11	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	16	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	13	0
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	22	24
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	32	24
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	26	24
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	75
1	LOCAL_READS	41
2	READS	1820
2	LOCAL_READS	1793
3	READS	21
3	LOCAL_READS	0
4	READS	287
4	LOCAL_READS	219
5	READS	23
5	LOCAL_READS	0
6	READS	158
6	LOCAL_READS	39
OI scan
explain select * from test.t1 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t1`.`c` > 6); Using MRR
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1` where (`test`.`t1`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	11	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	16	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	13	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	22	24
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	32	24
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	26	24
Table scan
explain select * from test.t1;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c`,`test`.`t1`.`d` AS `d` from `test`.`t1`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	11	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	16	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	13	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	22	32
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	32	32
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	26	32
Test pushed queries (SPJ)
Pushed pk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	11	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	16	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	13	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	45	40
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	64	40
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	51	40
Pushed uk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	34	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	48	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	38	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	67	40
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	96	40
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	76	40
Pushed uk->pk
Lookup to get a.d, feeding pk lookup of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a
where a.b = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ref	b	b	5	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`a` = `test`.`a`.`d`) and (`test`.`a`.`b` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	45	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	64	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	51	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	90	40
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	128	40
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	101	40
Pushed pk->uk
Lookup to get a.d, feeding uk lookup of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b
where a.a = 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	eq_ref	PRIMARY,a	PRIMARY	4	const	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`b` = `test`.`a`.`d`) and (`test`.`a`.`a` = 6))
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	57	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	80	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	63	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	112	40
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	160	40
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	126	40
Pushed scan originating sub-lookups
Table scan to get a.d, feeding pk lookups of b.a
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	eq_ref	PRIMARY,a	PRIMARY	4	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`a` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.a;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	57	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	80	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	63	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	124	48
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	176	48
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	138	48
Pushed scan originating sub-lookups
Table scan to get a.d, feeding uk lookups of b.b
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	ALL	NULL	NULL	NULL	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition (`test`.`a`.`d` is not null)
1	SIMPLE	b	#	ref	b	b	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where (`test`.`b`.`b` = `test`.`a`.`d`)
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
a.d = b.b;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	69	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	96	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	75	0
test/def/t1	sys/def/11/c	Ordered index	2	0	8
test/def/t1	sys/def/11/c	Ordered index	4	0	8
test/def/t1	sys/def/11/c	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	135	56
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	192	56
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	150	56
Pushed scan originating sub-scans
Range scan on a.a > 10 getting a.d, feeding range scans on b.c = a.d
explain select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	a	#	range	PRIMARY,a	PRIMARY	4	NULL	#	#	Parent of 2 pushed join@1; Using pushed condition ((`test`.`a`.`a` > 10) and (`test`.`a`.`d` is not null)); Using MRR
1	SIMPLE	b	#	ref	c	c	5	test.a.d	#	#	Child of 'a' in pushed join@1
Warnings:
Note	1003	/* select#1 */ select `test`.`a`.`a` AS `a`,`test`.`a`.`d` AS `d`,`test`.`b`.`d` AS `d` from `test`.`t1` `a` join `test`.`t1` `b` where ((`test`.`b`.`c` = `test`.`a`.`d`) and (`test`.`a`.`a` > 10))
select a.a, a.d, b.d
from
test.t1 a
join
test.t1 b
on
b.c=a.d
where
a.a>10;
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t1' OR fq_name='test/def/t1') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t1	sys/def/11/b$unique	Unique hash index	2	69	0
test/def/t1	sys/def/11/b$unique	Unique hash index	4	96	0
test/def/t1	sys/def/11/b$unique	Unique hash index	6	75	0
test/def/t1	sys/def/11/c	Ordered index	2	0	32
test/def/t1	sys/def/11/c	Ordered index	4	0	32
test/def/t1	sys/def/11/c	Ordered index	6	0	32
test/def/t1	sys/def/11/PRIMARY	Ordered index	2	0	8
test/def/t1	sys/def/11/PRIMARY	Ordered index	4	0	8
test/def/t1	sys/def/11/PRIMARY	Ordered index	6	0	8
NULL	test/def/t1	User table	1	0	8
NULL	test/def/t1	User table	2	135	56
NULL	test/def/t1	User table	3	0	8
NULL	test/def/t1	User table	4	192	56
NULL	test/def/t1	User table	5	0	8
NULL	test/def/t1	User table	6	150	56
Tests on T2 (Blobs)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	0	12
NULL	test/def/t2	User table	3	0	4
NULL	test/def/t2	User table	4	0	12
NULL	test/def/t2	User table	5	0	4
NULL	test/def/t2	User table	6	0	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	75
1	LOCAL_READS	41
2	READS	1864
2	LOCAL_READS	1837
3	READS	21
3	LOCAL_READS	0
4	READS	351
4	LOCAL_READS	283
5	READS	23
5	LOCAL_READS	0
6	READS	210
6	LOCAL_READS	91
Test some basic NdbApi
explain select * from test.t2 where t2.a=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	eq_ref	PRIMARY	PRIMARY	4	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`a` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_16_3	User table	2	11	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	4	16	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	6	13	0
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	22	12
NULL	test/def/t2	User table	3	0	4
NULL	test/def/t2	User table	4	32	12
NULL	test/def/t2	User table	5	0	4
NULL	test/def/t2	User table	6	26	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	75
1	LOCAL_READS	41
2	READS	1888
2	LOCAL_READS	1860
3	READS	21
3	LOCAL_READS	0
4	READS	383
4	LOCAL_READS	315
5	READS	23
5	LOCAL_READS	0
6	READS	236
6	LOCAL_READS	117
UI lookups
explain select * from test.t2 where t2.b=6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ref	b	b	5	const	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_16_3	User table	2	22	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	4	32	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	6	26	0
test/def/t2	sys/def/16/b$unique	Unique hash index	2	22	0
test/def/t2	sys/def/16/b$unique	Unique hash index	4	32	0
test/def/t2	sys/def/16/b$unique	Unique hash index	6	26	0
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	44	12
NULL	test/def/t2	User table	3	0	4
NULL	test/def/t2	User table	4	64	12
NULL	test/def/t2	User table	5	0	4
NULL	test/def/t2	User table	6	52	12
select node_id, counter_name, sum(val) from ndbinfo.counters
where counter_name = 'READS' or counter_name = 'LOCAL_READS'
  group by node_id, counter_name;
node_id	counter_name	sum(val)
1	READS	75
1	LOCAL_READS	41
2	READS	1943
2	LOCAL_READS	1915
3	READS	21
3	LOCAL_READS	0
4	READS	463
4	LOCAL_READS	395
5	READS	23
5	LOCAL_READS	0
6	READS	301
6	LOCAL_READS	182
OI scan
explain select * from test.t2 where c > 6;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	range	c	c	5	NULL	#	#	Using pushed condition (`test`.`t2`.`c` > 6)
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`c` > 6)
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_16_3	User table	2	32	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	4	45	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	6	38	0
test/def/t2	sys/def/16/b$unique	Unique hash index	2	22	0
test/def/t2	sys/def/16/b$unique	Unique hash index	4	32	0
test/def/t2	sys/def/16/b$unique	Unique hash index	6	26	0
test/def/t2	sys/def/16/c	Ordered index	2	0	8
test/def/t2	sys/def/16/c	Ordered index	4	0	8
test/def/t2	sys/def/16/c	Ordered index	6	0	8
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	44	12
NULL	test/def/t2	User table	3	0	4
NULL	test/def/t2	User table	4	64	12
NULL	test/def/t2	User table	5	0	4
NULL	test/def/t2	User table	6	52	12
Table scan
explain select * from test.t2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t2	#	ALL	NULL	NULL	NULL	NULL	#	#	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2`
select parent_fq_name, fq_name, type, node_id, sum(tot_key_reads), sum(tot_frag_scans)
from ndbinfo.operations_per_fragment
where (parent_fq_name='test/def/t2' OR fq_name='test/def/t2') and
(tot_key_reads > 0 or tot_frag_scans > 0)
group by parent_fq_name, fq_name, type, node_id;
parent_fq_name	fq_name	type	node_id	sum(tot_key_reads)	sum(tot_frag_scans)
test/def/t2	test/def/NDB$BLOB_16_3	User table	2	43	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	4	61	0
test/def/t2	test/def/NDB$BLOB_16_3	User table	6	51	0
test/def/t2	sys/def/16/b$unique	Unique hash index	2	22	0
test/def/t2	sys/def/16/b$unique	Unique hash index	4	32	0
test/def/t2	sys/def/16/b$unique	Unique hash index	6	26	0
test/def/t2	sys/def/16/c	Ordered index	2	0	8
test/def/t2	sys/def/16/c	Ordered index	4	0	8
test/def/t2	sys/def/16/c	Ordered index	6	0	8
NULL	test/def/t2	User table	1	0	4
NULL	test/def/t2	User table	2	44	20
NULL	test/def/t2	User table	3	0	4
NULL	test/def/t2	User table	4	64	20
NULL	test/def/t2	User table	5	0	4
NULL	test/def/t2	User table	6	52	20
drop table hints;
delete from t1;
delete from t2;
drop table test.t1;
drop table test.t2;