call mtr.add_suppression("InnoDB: Warning: Small buffer pool size");
SET @global_innodb_file_per_table_orig = @@global.innodb_file_per_table;
SET GLOBAL innodb_file_per_table = on;
CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 INT, c3 TEXT)
ENGINE=InnoDB STATS_PERSISTENT=0;
INSERT INTO t1 VALUES (1,1,''), (2,2,''), (3,3,''), (4,4,''), (5,5,'');
SET GLOBAL innodb_monitor_enable = module_ddl;
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SET DEBUG_SYNC = 'RESET';
SET DEBUG_SYNC = 'write_row_noreplace SIGNAL have_handle WAIT_FOR go_ahead';
INSERT INTO t1 VALUES(1,2,3);
SET DEBUG_SYNC = 'now WAIT_FOR have_handle';
SET lock_wait_timeout = 1;
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
SET DEBUG_SYNC = 'now SIGNAL go_ahead';
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SET SESSION DEBUG = '+d,innodb_OOM_prepare_inplace_alter';
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space
SET SESSION DEBUG = '-d,innodb_OOM_prepare_inplace_alter';
SET SESSION DEBUG = '+d,innodb_OOM_inplace_alter';
CREATE UNIQUE INDEX c2 ON t1(c2);
ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space
SET SESSION DEBUG = '-d,innodb_OOM_inplace_alter';
CREATE UNIQUE INDEX c2 ON t1(c2);
DROP INDEX c2 ON t1;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` int(11) NOT NULL,
`c2` int(11) DEFAULT NULL,
`c3` text,
PRIMARY KEY (`c1`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=0
BEGIN;
INSERT INTO t1 VALUES(7,4,2);
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL scanned WAIT_FOR rollback_done';
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
COMMIT;
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR 23000: Duplicate entry '4' for key 'c2'
DELETE FROM t1 WHERE c1 = 7;
ALTER TABLE t1 ADD FOREIGN KEY(c2) REFERENCES t1(c2), ALGORITHM = INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Adding foreign keys needs foreign_key_checks=OFF. Try ALGORITHM=COPY.
ALTER TABLE t1 ADD UNIQUE INDEX(c2), LOCK = EXCLUSIVE, ALGORITHM = INPLACE;
DROP INDEX c2 ON t1;
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
SET DEBUG_SYNC = 'now WAIT_FOR scanned';
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 1
ddl_pending_alter_table 1
BEGIN;
INSERT INTO t1 VALUES(7,4,2);
ROLLBACK;
SET DEBUG_SYNC = 'now SIGNAL rollback_done';
ERROR 23000: Duplicate entry '4' for key 'c2'
SET DEBUG_SYNC = 'row_log_apply_after SIGNAL created WAIT_FOR dml_done';
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
SET DEBUG_SYNC = 'now WAIT_FOR created';
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 1
INSERT INTO t1 VALUES(6,3,1);
SET DEBUG_SYNC = 'now SIGNAL dml_done';
ERROR 23000: Duplicate entry for key 'c2'
DELETE FROM t1 WHERE c1=6;
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
INSERT INTO t1 VALUES(6,3,1);
ERROR 23000: Duplicate entry '3' for key 'c2'
INSERT INTO t1 VALUES(7,4,2);
ERROR 23000: Duplicate entry '4' for key 'c2'
ALTER TABLE t1 STATS_PERSISTENT=1;
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
UPDATE mysql.innodb_index_stats SET stat_value = 5
WHERE database_name = 'test' AND table_name= 't1' AND index_name = 'PRIMARY'
AND stat_value = 6;
SELECT * FROM mysql.innodb_index_stats WHERE table_name IN ('t1');
database_name table_name index_name last_update stat_name stat_value sample_size stat_description
test t1 PRIMARY LAST_UPDATE n_diff_pfx01 5 1 c1
test t1 PRIMARY LAST_UPDATE n_leaf_pages 1 NULL Number of leaf pages in the index
test t1 PRIMARY LAST_UPDATE size 1 NULL Number of pages in the index
test t1 c2 LAST_UPDATE n_diff_pfx01 5 1 c2
test t1 c2 LAST_UPDATE n_leaf_pages 1 NULL Number of leaf pages in the index
test t1 c2 LAST_UPDATE size 1 NULL Number of pages in the index
CREATE TABLE t1_c2_stats SELECT * FROM mysql.innodb_index_stats
WHERE database_name = 'test' AND table_name = 't1' and index_name = 'c2';
ALTER TABLE t1_c2_stats ENGINE=INNODB;
DROP INDEX c2 ON t1;
ANALYZE TABLE t1_c2_stats;
Table Op Msg_type Msg_text
test.t1_c2_stats analyze status OK
SELECT * FROM mysql.innodb_index_stats WHERE table_name IN ('t1', 't1_c2_stats');
database_name table_name index_name last_update stat_name stat_value sample_size stat_description
test t1 PRIMARY LAST_UPDATE n_diff_pfx01 5 1 c1
test t1 PRIMARY LAST_UPDATE n_leaf_pages 1 NULL Number of leaf pages in the index
test t1 PRIMARY LAST_UPDATE size 1 NULL Number of pages in the index
test t1_c2_stats GEN_CLUST_INDEX LAST_UPDATE n_diff_pfx01 3 1 DB_ROW_ID
test t1_c2_stats GEN_CLUST_INDEX LAST_UPDATE n_leaf_pages 1 NULL Number of leaf pages in the index
test t1_c2_stats GEN_CLUST_INDEX LAST_UPDATE size 1 NULL Number of pages in the index
KILL QUERY @id;
ERROR 70100: Query execution was interrupted
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2d_created WAIT_FOR kill_done';
CREATE INDEX c2d ON t1(c2);
SET DEBUG_SYNC = 'now WAIT_FOR c2d_created';
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 1
ddl_pending_alter_table 1
KILL QUERY @id;
SET DEBUG_SYNC = 'now SIGNAL kill_done';
ERROR 70100: Query execution was interrupted
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
INSERT INTO t1 SELECT 5 + c1, c2, c3 FROM t1;
INSERT INTO t1 SELECT 10 + c1, c2, c3 FROM t1;
INSERT INTO t1 SELECT 20 + c1, c2, c3 FROM t1;
INSERT INTO t1 SELECT 40 + c1, c2, c3 FROM t1;
EXPLAIN SELECT COUNT(*) FROM t1 WHERE c2 > 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 80 Using where
ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status OK
UPDATE t1_c2_stats SET index_name = 'c2d';
UPDATE t1_c2_stats SET stat_value = 2 WHERE stat_name = 'n_diff_pfx01';
INSERT INTO t1_c2_stats
SELECT database_name, table_name, index_name, last_update, 'n_diff_pfx02', 80,
sample_size, 'c2,c1' FROM t1_c2_stats
WHERE stat_name = 'n_diff_pfx01' AND stat_description = 'c2';
INSERT INTO mysql.innodb_index_stats SELECT * FROM t1_c2_stats;
DROP TABLE t1_c2_stats;
CREATE INDEX c2d ON t1(c2);
SHOW INDEX FROM t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 0 PRIMARY 1 c1 A 80 NULL NULL BTREE
t1 1 c2d 1 c2 A 10 NULL NULL YES BTREE
EXPLAIN SELECT COUNT(*) FROM t1 WHERE c2 > 3;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range c2d c2d 5 NULL 32 Using where; Using index
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` int(11) NOT NULL,
`c2` int(11) DEFAULT NULL,
`c3` text,
PRIMARY KEY (`c1`),
KEY `c2d` (`c2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=1
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2e_created WAIT_FOR dml2_done';
SET lock_wait_timeout = 10;
ALTER TABLE t1 CHANGE c2 c22 INT, DROP INDEX c2d, ADD INDEX c2e(c22),
ALGORITHM = INPLACE;
INSERT INTO t1 SELECT 80 + c1, c2, c3 FROM t1;
INSERT INTO t1 SELECT 160 + c1, c2, c3 FROM t1;
UPDATE t1 SET c2 = c2 + 1;
SET DEBUG_SYNC = 'now WAIT_FOR c2e_created';
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 1
ddl_pending_alter_table 1
BEGIN;
DELETE FROM t1;
ROLLBACK;
UPDATE t1 SET c2 = c2 + 1;
BEGIN;
UPDATE t1 SET c2 = c2 + 1;
DELETE FROM t1;
ROLLBACK;
BEGIN;
DELETE FROM t1;
ROLLBACK;
UPDATE t1 SET c2 = c2 + 1;
BEGIN;
UPDATE t1 SET c2 = c2 + 1;
DELETE FROM t1;
ROLLBACK;
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 1
ddl_pending_alter_table 1
SELECT sf.name, sf.pos FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES si
INNER JOIN INFORMATION_SCHEMA.INNODB_SYS_FIELDS sf
ON si.index_id = sf.index_id WHERE si.name = '?c2e';
name pos
c2 0
SET DEBUG_SYNC = 'now SIGNAL dml2_done';
ERROR HY000: Creating index 'c2e' required more than 'innodb_online_alter_log_max_size' bytes of modification log. Please try again.
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 1
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SELECT sf.name, sf.pos FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES si
INNER JOIN INFORMATION_SCHEMA.INNODB_SYS_FIELDS sf
ON si.index_id = sf.index_id WHERE si.name = 'c2e';
name pos
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 1
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
ALTER TABLE t1 COMMENT 'testing if c2e will be dropped';
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c2f_created WAIT_FOR dml3_done';
ALTER TABLE t1 ADD INDEX c2f(c22f), CHANGE c2 c22f INT;
SET DEBUG_SYNC = 'now WAIT_FOR c2f_created';
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 1
ddl_pending_alter_table 1
BEGIN;
INSERT INTO t1 SELECT 320 + c1, c2, c3 FROM t1 WHERE c1 > 160;
DELETE FROM t1 WHERE c1 > 320;
ROLLBACK;
BEGIN;
UPDATE t1 SET c2 = c2 + 1;
DELETE FROM t1;
ROLLBACK;
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 1
ddl_pending_alter_table 1
SET DEBUG_SYNC = 'now SIGNAL dml3_done';
Warnings:
Note 1831 Duplicate index 'c2f' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SELECT COUNT(c22f) FROM t1;
COUNT(c22f)
320
CHECK TABLE t1;
Table Op Msg_type Msg_text
test.t1 check status OK
ALTER TABLE t1 ADD UNIQUE INDEX c3p5(c3(5));
ERROR 23000: Duplicate entry 'NULL' for key 'c3p5'
UPDATE t1 SET c3 = NULL WHERE c3 = '';
SET lock_wait_timeout = 1;
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL c3p5_created WAIT_FOR ins_done';
ALTER TABLE t1 ADD UNIQUE INDEX c3p5(c3(5));
SET DEBUG_SYNC = 'now WAIT_FOR c3p5_created';
SELECT sf.name, sf.pos FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES si
INNER JOIN INFORMATION_SCHEMA.INNODB_SYS_FIELDS sf
ON si.index_id = sf.index_id WHERE si.name = '?c3p5';
name pos
c3 0
SET DEBUG_SYNC = 'ib_after_row_insert SIGNAL ins_done WAIT_FOR ddl_timed_out';
INSERT INTO t1 VALUES(347,33101,NULL);
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
SET DEBUG_SYNC = 'now SIGNAL ddl_timed_out';
SELECT sf.name, sf.pos FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES si
INNER JOIN INFORMATION_SCHEMA.INNODB_SYS_FIELDS sf
ON si.index_id = sf.index_id WHERE si.name = 'c3p5';
name pos
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 1
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 1
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` int(11) NOT NULL,
`c22f` int(11) DEFAULT NULL,
`c3` text,
PRIMARY KEY (`c1`),
KEY `c2d` (`c22f`),
KEY `c2f` (`c22f`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 STATS_PERSISTENT=1 COMMENT='testing if c2e will be dropped'
ALTER TABLE t1 DROP INDEX c2d, DROP INDEX c2f;
SELECT name, count FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE subsystem = 'ddl';
name count
ddl_background_drop_indexes 0
ddl_background_drop_tables 0
ddl_online_create_index 0
ddl_pending_alter_table 0
ALTER TABLE t1 ADD INDEX c2h(c22f), ALGORITHM = INPLACE;
ALTER TABLE t1 ADD INDEX c2h(c22f), ALGORITHM = COPY;
ERROR 42000: Duplicate key name 'c2h'
SET DEBUG_SYNC = 'RESET';
SET DEBUG = '';
SET GLOBAL innodb_monitor_disable = module_ddl;
DROP TABLE t1;
SET GLOBAL DEBUG = '';
SET GLOBAL innodb_file_per_table = @global_innodb_file_per_table_orig;
SET GLOBAL innodb_monitor_enable = default;
SET GLOBAL innodb_monitor_disable = default;