use ndbinfo;
create table test.t1 (a int primary key, b int, c int, unique(b), key(c)) engine=ndb;
create view frag_locks as 
select fq_name = 'test/def/t1' as main_tab,
type, 
sum(ex_req) as ex_reqs, 
sum(ex_imm_ok) as ex_imm_oks, 
sum(ex_wait_ok) as ex_wait_oks, 
sum(ex_wait_fail) as ex_wait_fails,
sum(sh_req) as sh_reqs, 
sum(sh_imm_ok) as sh_imm_oks, 
sum(sh_wait_ok) as sh_wait_oks, 
sum(sh_wait_fail) as sh_wait_fails
from locks_per_fragment
where 
fq_name = 'test/def/t1' or
parent_fq_name = 'test/def/t1'
    group by
main_tab, type;
No locks taken
select * from frag_locks;
main_tab	type	ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fails
0	Unique hash index	0	0	0	0	0	0	0	0
1	User table	0	0	0	0	0	0	0	0
create table baseline as select * from frag_locks;
create table current like baseline;
create view baseline_diff as
select c.ex_reqs - b.ex_reqs as ex_reqs,
c.ex_imm_oks - b.ex_imm_oks as ex_imm_oks,
c.ex_wait_oks - b.ex_wait_oks as ex_wait_oks,
c.ex_wait_fails - b.ex_wait_fails as ex_wait_fails,
c.sh_reqs - b.sh_reqs as sh_reqs,
c.sh_imm_oks - b.sh_imm_oks as sh_imm_oks,
c.sh_wait_oks - b.sh_wait_oks as sh_wait_oks,
c.sh_wait_fails - b.sh_wait_fails as sh_wait_fail,
c.type,
c.main_tab
from baseline b join current c on 
b.type = c.type and
b.main_tab = c.main_tab
order by main_tab desc;
Start testing
Insert some data
insert into test.t1 values (1,1,1), (2,2,2), (3,3,3), (4,4,4), (5,5,5), (6,6,6), (7,7,7), (8,8,8);
Expect :
1.  NoOfReplicas(2) * NumRows * Exclusive row locks immediately claimed on user table
2.  NoOfReplicas(2) * NumRows * Exclusive row locks immediately claimed on unique index table
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
16	16	0	0	0	0	0	0	User table	1
16	16	0	0	0	0	0	0	Unique hash index	0
Read committed by PK
select * from test.t1 where a=7;
a	b	c
7	7	7
Expect : 
1.  No increments
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Read shared by PK
select * from test.t1 where a=7 lock in share mode;
a	b	c
7	7	7
Expect : 
1.  1 sh lock on TAB
2.  No effect on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Read exclusive by PK
select * from test.t1 where a=7 for update;
a	b	c
7	7	7
Expect : 
1.  1 ex lock on TAB
2.  No effect on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Update by PK
update test.t1 set c=50 where a=5;
Expect : 
1.  2 * 2 ex locks on TAB
2.  No effect on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Update by PK, UK affected
update test.t1 set b=50 where a=5;
Expect : 
1.  2 * 1 ex on TAB
Extra tab read here?
2.  2 * 2 * ex on UI table (Delete old row, Insert new)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
3	3	0	0	0	0	0	0	User table	1
4	4	0	0	0	0	0	0	Unique hash index	0
****************************************************
Delete by PK
delete from test.t1 where a=5;
Expect : 
1.  2 * 1 * ex on TAB
2.  2 * 1 * ex on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	Unique hash index	0
****************************************************
Read committed by UK
select * from test.t1 where b=3;
a	b	c
3	3	3
Expect:
1.  1 * SH on TAB (upgrade)
2.  1 * SH on UI (upgrade)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	1	1	0	0	Unique hash index	0
****************************************************
Read shared by UK
select * from test.t1 where b=3 lock in share mode;
a	b	c
3	3	3
Expect:
1.  1 * SH on TAB
2.  1 * SH on TAB
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	1	1	0	0	Unique hash index	0
****************************************************
Read exclusive by UK
select * from test.t1 where b=3 for update;
a	b	c
3	3	3
Expect:
1.  1 * EX on TAB
2.  1 * EX on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
1	1	0	0	0	0	0	0	Unique hash index	0
****************************************************
Update by UK, not affecting UK value
update test.t1 set c=30 where b=3;
Expect:
1.  2 * 1 EX on TAB
2.  1 * EX on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
1	1	0	0	0	0	0	0	Unique hash index	0
****************************************************
Update by UK, affecting UK value
update test.t1 set b=30 where b=3;
Expect:
1.  1 + 2 * 1  EX on TAB
2.  1 + 2 * 2  EX on UI
Due to : Ex read by UK -> Ex read of PK -> 
Update T by PK (*NR) -> 
Delete + Insert of UI by PK (*NR)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
3	3	0	0	0	0	0	0	User table	1
5	5	0	0	0	0	0	0	Unique hash index	0
****************************************************
Delete by UK
delete from test.t1 where b=30;
Expect:
1.  1 + 2 * 1 EX on TAB
2.  1 + 2 * 1 EX on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
3	3	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with no locks
select * from test.t1 order by a;
a	b	c
1	1	1
2	2	2
4	4	4
6	6	6
7	7	7
8	8	8
Expect : No locking
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with shared lock, held on no rows
select * from test.t1 where a%1234 = 1233 lock in share mode;
a	b	c
Expect : Lock taken on each row, but not held
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	6	6	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with shared lock, held on 1 row
select * from test.t1 where a%1234 = 8 lock in share mode;
a	b	c
8	8	8
Expect : Lock taken on each row, one held via takeover
x+1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	7	7	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with shared lock, held on all rows
select * from test.t1 where a%1234 > 0 order by a lock in share mode;
a	b	c
1	1	1
2	2	2
4	4	4
6	6	6
7	7	7
8	8	8
Expect : Lock taken on each row, all held via takeover
2x
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	12	12	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with exclusive lock, held on no rows
select * from test.t1 where a%1234 = 1233 for update;
a	b	c
Expect : Lock taken on each row, but not held
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
6	6	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with exclusive lock, held on 1 row
select * from test.t1 where a%1234 = 8 for update;
a	b	c
8	8	8
Expect : Lock taken on each row, one held via takeover
x+1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
7	7	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
OI scan (Primary) with exclusive lock, held on all rows
select * from test.t1 where a%1234 > 0 order by a for update;
a	b	c
1	1	1
2	2	2
4	4	4
6	6	6
7	7	7
8	8	8
Expect : Lock taken on each row, all held via takeover
2x
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
12	12	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Multiple locks from a single transaction on one row
begin;
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
Upgrade
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
commit;
Expect : 3 * Ex lock + 3 * Sh lock
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
3	3	0	0	3	3	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
****************
Show lock Delays
****************
SH <- EX PK
Take and hold shared lock on a row
begin;
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
Attempt to get an exclusive lock from a separate 
transaction, PK read
select * from test.t1 where a=1 for update;;
Give request a chance to be registered and wait
Rollback lock holder, allowing con2 to get lock
rollback;
a	b	c
1	1	1
Expect :
Exclusive lock successfully claimed after some delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	0	1	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
SH <- EX SCAN
Take and hold shared lock on a row
begin;
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
Attempt to get an exclusive lock from a separate 
transaction, OI scan
select * from test.t1 where a % 1245 = 1 for update;;
Give request a chance to be registered and wait
Rollback lock holder, allowing con2 to get lock
rollback;
a	b	c
1	1	1
Expect :
x - 1 EX locks taken immediately
1 EX lock taken after wait
1 EX lock taken immediately (Takeover) 
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
7	6	1	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
EX <- SH UI
Take and hold exclusive lock on a row
begin;
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
Attempt to get a shared lock from a separate 
transaction, UK read
select * from test.t1 where b=1 lock in share mode;;
Give request a chance to be registered and wait
Rollback lock holder, allowing con2 to get lock
rollback;
a	b	c
1	1	1
Expect :
Shared lock immediately claimed on UI
Shared lock successfully claimed on TAB after some delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	0	1	0	User table	1
0	0	0	0	1	1	0	0	Unique hash index	0
****************************************************
SH <- EX UI
Take and hold shared lock on a row
begin;
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
Attempt to get an exclusive lock from a separate 
transaction, UK read
select * from test.t1 where b = 1 for update;;
Give request a chance to be registered and wait
Rollback lock holder, allowing con2 to get lock
rollback;
a	b	c
1	1	1
Expect :
Ex lock immediately claimed on UI
Ex lock successfully claimed on TAB after some delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	0	1	0	0	0	0	0	User table	1
1	1	0	0	0	0	0	0	Unique hash index	0
****************************************************
EX <- SH PK
Take and hold exclusive lock on a row
begin;
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
Attempt to get a shared lock from a separate 
transaction, PK read
select * from test.t1 where a=1 lock in share mode;;
Give request a chance to be registered and wait
Rollback lock holder, allowing con2 to get lock
rollback;
a	b	c
1	1	1
Expect :
Shared lock successfully claimed after some delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	0	1	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
EX <- SH SCAN
Take and hold exclusive lock on a row
begin;
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
Attempt to get a shared lock from a separate 
transaction, OI scan
select * from test.t1 where a % 1245 = 1 lock in share mode;;
Give request a chance to be registered and wait
Rollback lock holder, allowing con2 to get lock
rollback;
a	b	c
1	1	1
Expect :
x - 1 SH locks taken immediately
1 SH lock taken after wait
1 SH lock taken immediately (Takeover) 
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	7	6	1	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
*******************
Lock claim failures
*******************
Take and hold shared lock on a row
begin;
select * from test.t1 where a=1 lock in share mode;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
SH <- EX PK
Attempt to get an exclusive lock from a separate 
transaction, PK read
select * from test.t1 where a=1 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
Exclusive lock claim failed after some delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	0	0	1	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
SH <- EX UK
Attempt to get an exclusive lock from a separate 
transaction, UK read
select * from test.t1 where b=1 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
EX immediate on unique key
EX failed on TAB
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	0	0	1	0	0	0	0	User table	1
1	1	0	0	0	0	0	0	Unique hash index	0
****************************************************
SH <- EX OI Scan
Attempt to get an exclusive lock from a separate 
transaction, OI scan
select * from test.t1 where a % 1234 =1 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
x -1 EX immediate on TAB
1 EX failed on TAB
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
6	5	0	1	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Escalate 'holding' lock to EX
select * from test.t1 where a=1 for update;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
EX <- SH PK
Attempt to get a shared lock from a separate 
transaction, PK read
select * from test.t1 where a=1 lock in share mode;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
Shared lock claim failed after some delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	0	0	1	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
EX <- SH UK
Attempt to get a shared lock from a separate 
transaction, UK read
select * from test.t1 where b=1 lock in share mode;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
SH immediate on unique key
SH failed on TAB
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	0	0	1	User table	1
0	0	0	0	1	1	0	0	Unique hash index	0
****************************************************
EX <- SH OI Scan
Attempt to get a shared lock from a separate 
transaction, OI scan
select * from test.t1 where a % 1234 =1 lock in share mode;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
x -1 SH immediate on TAB
1 SH failed on TAB
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	6	5	0	1	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Escalate 'holding' lock to EX on UI too
select * from test.t1 where b=1 for update;
a	b	c
1	1	1
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
1	1	0	0	0	0	0	0	Unique hash index	0
EX UK <- SH UK
Attempt to get a shared lock from a separate 
transaction, UK read
select * from test.t1 where b=1 lock in share mode;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
SH failed on UK
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	1	0	0	1	Unique hash index	0
****************************************************
EX UK <- EX UK
Attempt to get an exclusive lock from a separate 
transaction, UK read
select * from test.t1 where b=1 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
Expect :
EX failed on UK
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
1	0	0	1	0	0	0	0	Unique hash index	0
****************************************************
rollback;
*******************
Row existence cases
*******************
Show table content
select * from test.t1 order by a;
a	b	c
1	1	1
2	2	2
4	4	4
6	6	6
7	7	7
8	8	8
SH PK read of non existing row
select * from test.t1 where a=1234 lock in share mode;
a	b	c
Expect : Nothing
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
EX PK read of non existing row
select * from test.t1 where a=1234 for update;
a	b	c
Expect : Nothing
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Update of non existing row
update test.t1 set c=1234 where a=1234;
Expect : Nothing
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Delete of non existing row
delete from test.t1 where a=1234;
Expect : Nothing
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Insert of existing row
insert into test.t1 values (1,1,1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
Expect : Nothing
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
*************
Special cases
*************
Existing row is deleted, other transaction waiting
for lock...
Prepare a delete on a row
begin;
delete from test.t1 where a=1;
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	Unique hash index	0
Attempt to read the row by PK
select * from test.t1 where a =1 lock in share mode;;
Give request a chance to be registered and wait
Commit the delete
commit;
a	b	c
Expect 1 SH lock on TAB, after delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	0	1	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
insert into test.t1 values (1,1,1);
Prepare a delete on a row
begin;
delete from test.t1 where a=1;
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
4	4	0	0	0	0	0	0	User table	1
4	4	0	0	0	0	0	0	Unique hash index	0
Attempt to read the row by UK
select * from test.t1 where b=1 lock in share mode;;
Give request a chance to be registered and wait
Commit the delete
commit;
a	b	c
Expect 1 SH lock on Unique, after delay
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	0	0	0	0	User table	1
0	0	0	0	1	0	1	0	Unique hash index	0
****************************************************
insert into test.t1 values (1,1,1);
Prepare a delete on a row
begin;
delete from test.t1 where a=1;
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
4	4	0	0	0	0	0	0	User table	1
4	4	0	0	0	0	0	0	Unique hash index	0
Attempt to read the row by OI scan
select * from test.t1 where a % 1234 = 1 lock in share mode;;
Give request a chance to be registered and wait
Commit the delete
commit;
a	b	c
Expect :
x - 1 SH locks immediately claimed
1 SH lock claimed after wait 
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	6	5	1	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
insert into test.t1 values (1,1,1);
Prepare a delete on a row
begin;
delete from test.t1 where a=1;
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
4	4	0	0	0	0	0	0	User table	1
4	4	0	0	0	0	0	0	Unique hash index	0
Attempt to insert a similar row
insert into test.t1 values (1,1,1);;
Give request a chance to be registered and wait
Commit the delete
commit;
Expect same as row never existed :
1 EX locks on TAB ok after wait (Insert, primary)
1 EX lock on TAB ok immediate (replica)
or wait @ replica
2 EX locks on UI immediate (Insert)
delete from current;
insert into current select * from frag_locks;
expect 2 ex_reqs, either immediate or wait
select ex_reqs, 
(ex_imm_oks + ex_wait_oks),
ex_wait_fails,
sh_reqs, sh_imm_oks, sh_wait_oks, sh_wait_fail,
main_tab, type from baseline_diff order by main_tab desc;
ex_reqs	(ex_imm_oks + ex_wait_oks)	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	main_tab	type
2	2	0	0	0	0	0	1	User table
2	2	0	0	0	0	0	0	Unique hash index
delete from baseline;
insert into baseline select * from current;
****************************************************
Prepare a delete on a row
begin;
delete from test.t1 where a=1;
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	Unique hash index	0
Attempt to delete the row from another transaction
delete from test.t1 where a=1;;
Give request a chance to be registered and wait
Commit the first delete
commit;
Expect :
1 EX lock wait ok
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	0	1	0	0	0	0	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Prepare to insert a new row
begin;
insert into test.t1 values (27, 27, 27);
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	Unique hash index	0
Attempt to read the row from another transaction
(PK SH)
select * from test.t1 where a=27 lock in share mode;;
Give request a chance to be registered and wait
Abort the insert
rollback;
a	b	c
Expect :
1 SH lock wait ok
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	0	1	0	User table	1
0	0	0	0	0	0	0	0	Unique hash index	0
****************************************************
Prepare to insert a new row
begin;
insert into test.t1 values (27, 27, 27);
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	Unique hash index	0
Attempt to insert the same row from another transaction
(PK SH)
insert into test.t1 values (27, 27, 27);;
Give request a chance to be registered and wait
Abort the first insert
rollback;
Expect :
1 EX lock wait ok on TAB (prim)
1 EX lock immed on TAB (backup)
2 EX lock immed ok on UI
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	1	1	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	Unique hash index	0
****************************************************
****************************************************
Show elapsed time added to totals
****************************************************
Timeout case
begin;
select * from test.t1 where a=2 lock in share mode;
a	b	c
2	2	2
begin;
select * from test.t1 where a=2 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
rollback;
rollback;
Show no extra 'ok' time, and some extra 'fail' time
Expect 0 ok_millis, > 0 fail_millis
ok_millis	fail_millis
0	1
****************************************************
Ok wait case
****************************************************
Expect > 0 ok_millis, 0 fail_millis
ok_millis	fail_millis
1	0
Warnings:
Warning	1287	Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
Warning	1287	Setting user variables within expressions is deprecated and will be removed in a future release. Consider alternatives: 'SET variable=expression, ...', or 'SELECT expression(s) INTO variables(s)'.
drop table test.t1;
delete from current;
delete from baseline;
*****
Blobs
*****
create table test.t1 (a int primary key, b text, c int) engine=ndb;
insert into baseline select * from frag_locks;
insert into test.t1 values (1,repeat('BJC', 300), 1);
Show insert lock footprint across main and
parts tables :
- Blob uses extra ops on main table row
to set length etc...
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
4	4	0	0	0	0	0	0	User table	1
2	2	0	0	0	0	0	0	User table	0
****************************************************
Show Blob read by PK Committed read
select a, length(b) from test.t1 where a=1;
a	length(b)
1	900
Expect SH on main table (Upgrade)
+ SH on parts table (SimpleRead)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	1	1	0	0	User table	0
****************************************************
Show Blob read by PK Shared
select a, length(b) from test.t1 where a=1 lock in share mode;
a	length(b)
1	900
Expect SH on main table
+ SH on parts table (SimpleRead)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	1	1	0	0	User table	0
****************************************************
Show Blob read by PK Exclusive
select a, length(b) from test.t1 where a=1 for update;
a	length(b)
1	900
Expect EX on main table
+ SH on parts table (SimpleRead)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
1	1	0	0	0	0	0	0	User table	1
0	0	0	0	1	1	0	0	User table	0
****************************************************
Show Blob read by scan Committed read, no rows returned
select a, length(b) from test.t1 where c != 1;
a	length(b)
Expect SH on main table
+ Nothing on parts table
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	0	0	0	0	User table	0
****************************************************
Show Blob read by scan Committed read, 1 row returned
select a, length(b) from test.t1 where c % 1234 = 1;
a	length(b)
1	900
Expect SH on main table
+ SH on parts table (SimpleRead)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	1	1	0	0	User table	1
0	0	0	0	1	1	0	0	User table	0
****************************************************
Show Blob read by scan shared, 1 row returned
select a, length(b) from test.t1 where c % 1234 = 1 lock in share mode;
a	length(b)
1	900
Expect 2* SH on main table
+ SH on parts table (SimpleRead)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
0	0	0	0	2	2	0	0	User table	1
0	0	0	0	1	1	0	0	User table	0
****************************************************
Show Blob read by scan exlusive, 1 row returned
select a, length(b) from test.t1 where c % 1234 = 1 for update;
a	length(b)
1	900
Expect 2* EX on main table
+ SH on parts table (SimpleRead)
ex_reqs	ex_imm_oks	ex_wait_oks	ex_wait_fails	sh_reqs	sh_imm_oks	sh_wait_oks	sh_wait_fail	type	main_tab
2	2	0	0	0	0	0	0	User table	1
0	0	0	0	1	1	0	0	User table	0
****************************************************
drop view baseline_diff;
drop table current;
drop table baseline;
drop view frag_locks;
drop table test.t1;