# This test changes undo related settings both at runtime, between restarts,
# and also after crashes.
# Note that innodb_undo_tablespaces is now fixed at 2 so only
# innodb_rollback_segments is tested here.
SET DEFAULT_STORAGE_ENGINE=InnoDB;
SET GLOBAL innodb_monitor_enable='module_buffer_page';
SET GLOBAL innodb_monitor_enable='trx_rseg_current_size';
#
# Create tables and check the default values.
#
CREATE TABLESPACE `ts1` ADD DATAFILE 'ts1.ibd';
CREATE TABLE t1 (a INT, b TEXT) TABLESPACE=`ts1`;
CREATE TABLE t2 (a INT, b TEXT) TABLESPACE=`innodb_system`;
CREATE TABLE t3 (a INT, b TEXT) TABLESPACE=`innodb_file_per_table`;
# Connection 1
INSERT INTO t1 VALUES (1, repeat('a',15));
INSERT INTO t2 VALUES (1, repeat('a',15));
INSERT INTO t3 VALUES (1, repeat('a',15));
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
SELECT COUNT(*) FROM t2;
COUNT(*)
1
SELECT COUNT(*) FROM t3;
COUNT(*)
1
# Connection 2
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
SELECT COUNT(*) FROM t2;
COUNT(*)
1
SELECT COUNT(*) FROM t3;
COUNT(*)
1
XA START 'x1';
INSERT INTO t1 VALUES (101, repeat('x1 ',5));
INSERT INTO t2 VALUES (101, repeat('x1 ',5));
INSERT INTO t3 VALUES (101, repeat('x1 ',5));
# Connection default
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	1
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	2
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	0
Innodb_undo_tablespaces_active	2
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
# Directory listing of UNDO tablespace files
undo_001
undo_002
#
# Change number of UNDO tablespaces from 2 to 3 while online.
#
CREATE UNDO TABLESPACE `undo_003` ADD DATAFILE 'undo_003.ibu';
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	1
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	3
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	1
Innodb_undo_tablespaces_active	3
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
# Connection 1
BEGIN;
INSERT INTO t1 VALUES (2, repeat('b',15));
INSERT INTO t2 VALUES (2, repeat('b',15));
INSERT INTO t3 VALUES (2, repeat('b',15));
# Connection 2
XA END 'x1';
XA PREPARE 'x1';
XA COMMIT 'x1';
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
101	x1 x1 x1 x1 x1 
SELECT COUNT(*) FROM t2;
COUNT(*)
2
SELECT COUNT(*) FROM t3;
COUNT(*)
2
XA START 'x2';
INSERT INTO t1 VALUES (102, repeat('x2 ',5));
INSERT INTO t2 VALUES (102, repeat('x2 ',5));
INSERT INTO t3 VALUES (102, repeat('x2 ',5));
XA END 'x2';
# Connection default
#
# Change number of UNDO tablespaces from 3 to 4 while online.
# Change number of Rollback Segments from 1 to 4 while online.
#
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	1
SET GLOBAL innodb_rollback_segments=4;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	4
CREATE UNDO TABLESPACE `undo_004` ADD DATAFILE 'undo_004.ibu';
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	4
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	2
Innodb_undo_tablespaces_active	4
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
101	x1 x1 x1 x1 x1 
SELECT COUNT(*) FROM t2;
COUNT(*)
2
SELECT COUNT(*) FROM t3;
COUNT(*)
2
# Connection 1
COMMIT;
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
101	x1 x1 x1 x1 x1 
SELECT COUNT(*) FROM t2;
COUNT(*)
3
SELECT COUNT(*) FROM t3;
COUNT(*)
3
INSERT INTO t1 VALUES (3, repeat('c',15));
INSERT INTO t2 VALUES (3, repeat('c',15));
INSERT INTO t3 VALUES (3, repeat('c',15));
# Connection 2
XA PREPARE 'x2';
XA COMMIT 'x2';
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
SELECT COUNT(*) FROM t2;
COUNT(*)
5
SELECT COUNT(*) FROM t3;
COUNT(*)
5
XA START 'x3';
INSERT INTO t1 VALUES (103, repeat('x3 ',5));
INSERT INTO t2 VALUES (103, repeat('x3 ',5));
INSERT INTO t3 VALUES (103, repeat('x3 ',5));
XA END 'x3';
XA PREPARE 'x3';
XA COMMIT 'x3';
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
6
SELECT COUNT(*) FROM t3;
COUNT(*)
6
# Connection default
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
6
SELECT COUNT(*) FROM t3;
COUNT(*)
6
#
# Change number of active UNDO tablespaces from 4 to 2 while online.
# Change number of Rollback Segments from 4 to 2 while online.
#
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	4
SET GLOBAL innodb_rollback_segments=2;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	2
ALTER UNDO TABLESPACE `undo_003` SET INACTIVE;
ALTER UNDO TABLESPACE `undo_004` SET INACTIVE;
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	4
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	2
Innodb_undo_tablespaces_active	2
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	empty
undo_004	Undo	Undo	empty
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
INSERT INTO t1 VALUES (4, repeat('d',15));
INSERT INTO t2 VALUES (4, repeat('d',15));
INSERT INTO t3 VALUES (4, repeat('d',15));
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
7
SELECT COUNT(*) FROM t3;
COUNT(*)
7
#
# Change number of UNDO tablespaces from 2 to 5 while online.
# Change number of Rollback Segments from 2 to 5 while online.
#
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	2
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	4
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	2
Innodb_undo_tablespaces_active	2
SET GLOBAL innodb_rollback_segments=5;
ALTER UNDO TABLESPACE `undo_003` SET ACTIVE;
ALTER UNDO TABLESPACE `undo_004` SET ACTIVE;
CREATE UNDO TABLESPACE `undo_005` ADD DATAFILE 'undo_005.ibu';
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	5
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	5
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	3
Innodb_undo_tablespaces_active	5
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
# Connection 1
INSERT INTO t1 VALUES (5, repeat('e',15));
INSERT INTO t2 VALUES (5, repeat('e',15));
INSERT INTO t3 VALUES (5, repeat('e',15));
# Connection default
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
8
SELECT COUNT(*) FROM t3;
COUNT(*)
8
#
# Shutdown mysqld cleanly.
# Delete one of the implicit UNDO tablespaces.
# Change number of Rollback Segments from 5 to 6 while offline.
# Restart mysqld with these larger settings.
#
# restart: --innodb_rollback_segments=6
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	6
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	5
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	3
Innodb_undo_tablespaces_active	5
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
#
# Shutdown mysqld cleanly.
# Change number of Rollback Segments from 6 to 4 while offline.
# Restart mysqld with these smaller settings.
#
ALTER UNDO TABLESPACE `undo_003` SET INACTIVE;
# restart: --innodb_rollback_segments=4
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	4
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	5
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	3
Innodb_undo_tablespaces_active	4
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	empty
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
#
# Kill and restart mysqld with one less active undo tablespace
# and less rollback segments=2.
#
ALTER UNDO TABLESPACE `undo_004` SET INACTIVE;
# Connection 1
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
8
SELECT COUNT(*) FROM t3;
COUNT(*)
8
BEGIN;
INSERT INTO t1  VALUES (6, repeat('f',15));
INSERT INTO t2  VALUES (6, repeat('f',15));
INSERT INTO t3  VALUES (6, repeat('f',15));
# Connection default
# Kill and restart: --innodb_rollback_segments=2
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	2
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	5
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	3
Innodb_undo_tablespaces_active	3
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	empty
undo_004	Undo	Undo	empty
undo_005	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
8
SELECT COUNT(*) FROM t3;
COUNT(*)
8
#
# Kill and restart mysqld with more undo tablespaces=6 and more rollback segments=7.
#
# Connection 1
BEGIN;
INSERT INTO t1  VALUES (7, repeat('g',15));
INSERT INTO t2  VALUES (7, repeat('g',15));
INSERT INTO t3  VALUES (7, repeat('g',15));
# Connection default
ALTER UNDO TABLESPACE `undo_003` SET ACTIVE;
ALTER UNDO TABLESPACE `undo_004` SET ACTIVE;
CREATE UNDO TABLESPACE `undo_006` ADD DATAFILE 'undo_006.ibu';
SHOW WARNINGS;
Level	Code	Message
# Kill and restart: --innodb_rollback_segments=7
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	6
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	4
Innodb_undo_tablespaces_active	6
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
undo_006	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
undo_006	UNDO LOG	./undo_006.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
undo_006.ibu
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
8
SELECT COUNT(*) FROM t3;
COUNT(*)
8
#
# Restart mysqld in read-only mode with more rollback segments=8.
#
# Connection 1
INSERT INTO t1  VALUES (8, repeat('h',15));
INSERT INTO t2  VALUES (8, repeat('h',15));
INSERT INTO t3  VALUES (8, repeat('h',15));
# Connection default
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
8	hhhhhhhhhhhhhhh
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
# restart: --innodb_read_only  --innodb_rollback_segments=8
CREATE UNDO TABLESPACE `undo_007` ADD DATAFILE 'undo_007.ibu';
ERROR HY000: Running in read-only mode
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	6
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	4
Innodb_undo_tablespaces_active	6
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
undo_006	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
undo_006	UNDO LOG	./undo_006.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
undo_006.ibu
SET GLOBAL innodb_rollback_segments=8;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SET GLOBAL innodb_rollback_segments=3;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
8	hhhhhhhhhhhhhhh
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
#
# Restart mysqld in force_recovery mode with more rollback segments=8.
#
# restart: --innodb_force_recovery=1 --innodb_rollback_segments=8
CREATE UNDO TABLESPACE `undo_007` ADD DATAFILE 'undo_007.ibu';
ERROR HY000: Changes to undo tablespaces are not allowed in force_recovery mode
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	6
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	4
Innodb_undo_tablespaces_active	6
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
undo_006	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
undo_006	UNDO LOG	./undo_006.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
undo_006.ibu
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SET GLOBAL innodb_rollback_segments=8;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SET GLOBAL innodb_rollback_segments=3;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	7
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
8	hhhhhhhhhhhhhhh
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
#
# Use SET PERSIST to change rollback segments=11
# and make some undo logs that must be rolled back on restart.
#
# restart: --innodb_rollback_segments=8
BEGIN;
INSERT INTO t1  VALUES (9, repeat('i',15));
INSERT INTO t2  VALUES (9, repeat('i',15));
INSERT INTO t3  VALUES (9, repeat('i',15));
SET PERSIST innodb_rollback_segments=11;
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	11
INSERT INTO t1  VALUES (10, repeat('j',15));
INSERT INTO t2  VALUES (10, repeat('j',15));
INSERT INTO t3  VALUES (10, repeat('j',15));
#
# Restart in normal mode with default undo tablespaces and rollback segments.
# The persisted settings will be set just after startup.
#
# restart
SHOW VARIABLES LIKE 'innodb_rollback_segments';
Variable_name	Value
innodb_rollback_segments	11
SHOW GLOBAL STATUS LIKE '%undo%';
Variable_name	Value
Innodb_undo_tablespaces_total	6
Innodb_undo_tablespaces_implicit	2
Innodb_undo_tablespaces_explicit	4
Innodb_undo_tablespaces_active	6
SELECT NAME, ROW_FORMAT, SPACE_TYPE, STATE FROM INFORMATION_SCHEMA.INNODB_TABLESPACES
WHERE name LIKE '%undo%' ORDER BY NAME;
NAME	ROW_FORMAT	SPACE_TYPE	STATE
innodb_undo_001	Undo	Undo	active
innodb_undo_002	Undo	Undo	active
undo_003	Undo	Undo	active
undo_004	Undo	Undo	active
undo_005	Undo	Undo	active
undo_006	Undo	Undo	active
SELECT TABLESPACE_NAME, FILE_TYPE, FILE_NAME FROM INFORMATION_SCHEMA.FILES
WHERE FILE_NAME LIKE '%undo%' ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME	FILE_TYPE	FILE_NAME
innodb_undo_001	UNDO LOG	./undo_001
innodb_undo_002	UNDO LOG	./undo_002
undo_003	UNDO LOG	./undo_003.ibu
undo_004	UNDO LOG	./undo_004.ibu
undo_005	UNDO LOG	./undo_005.ibu
undo_006	UNDO LOG	./undo_006.ibu
# Directory listing of UNDO tablespace files
undo_001
undo_002
undo_003.ibu
undo_004.ibu
undo_005.ibu
undo_006.ibu
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
8	hhhhhhhhhhhhhhh
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
9
SELECT COUNT(*) FROM t3;
COUNT(*)
9
INSERT INTO t1  VALUES (11, repeat('k',15));
INSERT INTO t2  VALUES (11, repeat('k',15));
INSERT INTO t3  VALUES (11, repeat('k',15));
SELECT * FROM t1 ORDER BY a;
a	b
1	aaaaaaaaaaaaaaa
2	bbbbbbbbbbbbbbb
3	ccccccccccccccc
4	ddddddddddddddd
5	eeeeeeeeeeeeeee
8	hhhhhhhhhhhhhhh
11	kkkkkkkkkkkkkkk
101	x1 x1 x1 x1 x1 
102	x2 x2 x2 x2 x2 
103	x3 x3 x3 x3 x3 
SELECT COUNT(*) FROM t2;
COUNT(*)
10
SELECT COUNT(*) FROM t3;
COUNT(*)
10
#
# Cleanup
#
DROP TABLE t1;
DROP TABLE t2;
DROP TABLE t3;
DROP TABLESPACE ts1;
ALTER UNDO TABLESPACE undo_003 SET INACTIVE;
ALTER UNDO TABLESPACE undo_004 SET INACTIVE;
ALTER UNDO TABLESPACE undo_005 SET INACTIVE;
ALTER UNDO TABLESPACE undo_006 SET INACTIVE;
DROP UNDO TABLESPACE undo_003;
DROP UNDO TABLESPACE undo_004;
DROP UNDO TABLESPACE undo_005;
DROP UNDO TABLESPACE undo_006;
SET PERSIST innodb_rollback_segments=default;
SET GLOBAL innodb_fast_shutdown=0;
# restart: --innodb_rollback_segments=1