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
ddl_sort_file_alter_table	0
ddl_log_file_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);
connect  con1,localhost,root,,;
connection con1;
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';
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
connection con1;
SET @saved_debug_dbug = @@SESSION.debug_dbug;
SET DEBUG_DBUG = '+d,innodb_OOM_prepare_inplace_alter';
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR HY000: Out of memory.
SET DEBUG_DBUG = @saved_debug_dbug;
SET DEBUG_DBUG = '+d,innodb_OOM_inplace_alter';
CREATE UNIQUE INDEX c2 ON t1(c2);
ERROR HY000: Out of memory.
SET DEBUG_DBUG = @saved_debug_dbug;
SET DEBUG_DBUG = '+d,innodb_OOM_prepare_add_index';
ALTER TABLE t1 ADD KEY(c2), ADD KEY c3_10(c3(10)), ADD KEY c3_c2(c3(4),c2);
ERROR HY000: Out of memory.
SET DEBUG_DBUG = @saved_debug_dbug;
CREATE UNIQUE INDEX c2 ON t1(c2);
DROP INDEX c2 ON t1;
connection default;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  `c2` int(11) DEFAULT NULL,
  `c3` text DEFAULT NULL,
  PRIMARY KEY (`c1`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci STATS_PERSISTENT=0
BEGIN;
INSERT INTO t1 VALUES(7,4,2);
connection con1;
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
connection default;
COMMIT;
connection con1;
ALTER TABLE t1 ADD UNIQUE INDEX(c2);
ERROR 23000: Duplicate entry '4' for key 'c2'
connection default;
DELETE FROM t1 WHERE c1 = 7;
connection con1;
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);
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
BEGIN;
INSERT INTO t1 VALUES(7,4,2);
ROLLBACK;
SET DEBUG_SYNC = 'now SIGNAL rollback_done';
connection con1;
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);
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
INSERT INTO t1 VALUES(6,3,1);
SET DEBUG_SYNC = 'now SIGNAL dml_done';
connection con1;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
connection default;
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	Engine-independent statistics collected
test.t1	analyze	Warning	Engine-independent statistics are not collected for column 'c3'
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	Engine-independent statistics collected
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
connection con1;
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);
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
KILL QUERY @id;
SET DEBUG_SYNC = 'now SIGNAL kill_done';
connection con1;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
connection default;
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	5	Using where
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	Warning	Engine-independent statistics are not collected for column 'c3'
test.t1	analyze	status	OK
connection con1;
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 DEFAULT NULL,
  PRIMARY KEY (`c1`),
  KEY `c2d` (`c2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci STATS_PERSISTENT=1
connection default;
SET @merge_encrypt_0=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
SET @merge_decrypt_0=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
SET @rowlog_encrypt_0=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
connection con1;
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, c3(10)), ALGORITHM = NOCOPY;
connection default;
INSERT INTO t1 SELECT  80 + c1, c2, c3 FROM t1;
INSERT INTO t1 SELECT 160 + c1, c2, c3 FROM t1;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	0
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;
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
ddl_sort_file_alter_table	0
ddl_log_file_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
c3	1
SET @merge_encrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
SET @merge_decrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
SET @rowlog_encrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
SELECT
(@merge_encrypt_1-@merge_encrypt_0)-
(@merge_decrypt_1-@merge_decrypt_0) as sort_balance,
@merge_encrypt_1>@merge_encrypt_0, @merge_decrypt_1>@merge_decrypt_0,
@rowlog_encrypt_1>@rowlog_encrypt_0;
sort_balance	@merge_encrypt_1>@merge_encrypt_0	@merge_decrypt_1>@merge_decrypt_0	@rowlog_encrypt_1>@rowlog_encrypt_0
0	0	0	0
SET DEBUG_SYNC = 'now SIGNAL dml2_done';
connection con1;
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
ddl_sort_file_alter_table	0
ddl_log_file_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
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	1
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	1
SET @merge_encrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
SET @merge_decrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
SET @rowlog_encrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
SET @rowlog_decrypt_1=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
connection con1;
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;
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_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;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	2
SET DEBUG_SYNC = 'now SIGNAL dml3_done';
connection con1;
Warnings:
Note	1831	Duplicate index `c2f`. 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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	2
connection default;
SET @merge_encrypt_2=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_encrypted');
SET @merge_decrypt_2=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_merge_blocks_decrypted');
SET @rowlog_encrypt_2=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_encrypted');
SET @rowlog_decrypt_2=
(SELECT variable_value FROM information_schema.global_status
WHERE variable_name = 'innodb_encryption_n_rowlog_blocks_decrypted');
SELECT
(@merge_encrypt_2-@merge_encrypt_1)-
(@merge_decrypt_2-@merge_decrypt_1) as sort_balance,
(@rowlog_encrypt_2-@rowlog_encrypt_1)-
(@rowlog_decrypt_2-@rowlog_decrypt_1) as log_balance;
sort_balance	log_balance
0	0
SELECT
@merge_encrypt_2-@merge_encrypt_1>0 as sort_encrypted,
@merge_decrypt_2-@merge_decrypt_1>0 as sort_decrypted,
@rowlog_encrypt_2-@rowlog_encrypt_1>0 as log_encrypted,
@rowlog_decrypt_2-@rowlog_decrypt_1>0 as log_decrypted;
sort_encrypted	sort_decrypted	log_encrypted	log_decrypted
0	0	0	0
connection con1;
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));
connection default;
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);
connection con1;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	2
connection default;
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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	2
connection default;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  `c22f` int(11) DEFAULT NULL,
  `c3` text DEFAULT NULL,
  PRIMARY KEY (`c1`),
  KEY `c2d` (`c22f`),
  KEY `c2f` (`c22f`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci 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
ddl_sort_file_alter_table	0
ddl_log_file_alter_table	2
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 GLOBAL innodb_monitor_disable = module_ddl;
DROP TABLE t1;
#
# MDEV-13205 assertion !dict_index_is_online_ddl(index) upon ALTER TABLE
#
CREATE TABLE t1 (c VARCHAR(64)) ENGINE=InnoDB;
INSERT INTO t1 VALUES('foo');
SET DEBUG_SYNC = 'row_log_apply_before SIGNAL t1u_created WAIT_FOR dup_done';
ALTER TABLE t1 ADD UNIQUE(c);
connection con1;
SET DEBUG_SYNC = 'now WAIT_FOR t1u_created';
BEGIN;
INSERT INTO t1 VALUES('bar'),('bar');
SET DEBUG_SYNC = 'now SIGNAL dup_done';
connection default;
ERROR 23000: Duplicate entry 'bar' for key 'c'
SET DEBUG_SYNC = 'RESET';
disconnect con1;
CREATE TABLE t2 (c VARCHAR(64)) ENGINE=InnoDB;
ALTER TABLE t2 ADD FOREIGN KEY (c) REFERENCES t1 (c);
ERROR HY000: Can't create table `test`.`t2` (errno: 150 "Foreign key constraint is incorrectly formed")
DROP TABLE t2,t1;
SET GLOBAL innodb_file_per_table = @global_innodb_file_per_table_orig;
SET GLOBAL innodb_monitor_enable  = default;
SET GLOBAL innodb_monitor_disable = default;