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set global innodb_table_locks=1;
select @@innodb_table_locks;
@@innodb_table_locks
1
set @@innodb_table_locks=1;
connect con1,localhost,root,,;
create table t1 (id integer, x integer) engine=INNODB;
insert into t1 values(0, 0);
set autocommit=0;
SELECT * from t1 where id = 0 FOR UPDATE;
id x
0 0
connect con2,localhost,root,,;
set autocommit=0;
lock table t1 write;
connection con1;
update t1 set x=1 where id = 0;
select * from t1;
id x
0 1
commit;
connection con2;
update t1 set x=2 where id = 0;
commit;
unlock tables;
connection con1;
select * from t1;
id x
0 2
commit;
drop table t1;
#
# Old lock method (where LOCK TABLE was ignored by InnoDB) no longer
# works when LOCK TABLE ... WRITE is used due to fix for bugs #46272
# "MySQL 5.4.4, new MDL: unnecessary and bug #37346 "innodb does not
# detect deadlock between update and alter table".
# After WL#6671 "Improve scalability by not using thr_lock.c locks
# for InnoDB tables" was implemented it no longer works for LOCK TABLES
# ,,, READ as well.
# LOCK TABLES locks are now completely handled by MDL subsystem.
#
set @@innodb_table_locks=0;
create table t1 (id integer primary key, x integer) engine=INNODB;
insert into t1 values(0, 0),(1,1),(2,2);
commit;
SELECT * from t1 where id = 0 FOR UPDATE;
id x
0 0
connection con2;
set autocommit=0;
set @@innodb_table_locks=0;
# The following statement should block because SQL-level lock
# is taken on t1 which will wait until concurrent transaction
# is commited.
# Sending:
lock table t1 write;;
connection con1;
# Wait until LOCK TABLE is blocked on SQL-level lock.
# We should be able to do UPDATEs and SELECTs within transaction.
update t1 set x=1 where id = 0;
select * from t1;
id x
0 1
1 1
2 2
# Unblock LOCK TABLE.
commit;
connection con2;
# Reap LOCK TABLE.
unlock tables;
connection con1;
select * from t1 where id = 0 for update;
id x
0 1
connection con2;
# The following statement should block because SQL-level lock
# is taken on t1 which will wait until concurrent transaction
# is commited.
# Sending:
lock table t1 read;;
connection con1;
# Wait until LOCK TABLE is blocked on SQL-level lock.
# We should be able to do UPDATEs and SELECTs within transaction.
update t1 set x=2 where id = 0;
select * from t1;
id x
0 2
1 1
2 2
# Unblock LOCK TABLE.
commit;
connection con2;
# Reap LOCK TABLE.
unlock tables;
connection default;
drop table t1;
#
#Bug#12842206 INNODB LOCKING REGRESSION FOR INSERT IGNORE
#fixed by re-fixing Bug#7975
#aka Bug#11759688 52020: InnoDB can still deadlock on just INSERT...
#
connection default;
CREATE TABLE t1 (a INT PRIMARY KEY, b INT NOT NULL) ENGINE=InnoDB;
INSERT INTO t1 VALUES(3,1);
BEGIN;
INSERT IGNORE INTO t1 VALUES(3,14);
Warnings:
Warning 1062 Duplicate entry '3' for key 'PRIMARY'
connection con1;
BEGIN;
INSERT IGNORE INTO t1 VALUES(3,23);
Warnings:
Warning 1062 Duplicate entry '3' for key 'PRIMARY'
SELECT * FROM t1 FOR UPDATE;
connection con2;
disconnect con2;
connection default;
COMMIT;
connection con1;
a b
3 1
COMMIT;
connection default;
DROP TABLE t1;
#
# MDEV-11080 InnoDB: Failing assertion:
# table->n_waiting_or_granted_auto_inc_locks > 0
#
CREATE TABLE t1 (pk INTEGER AUTO_INCREMENT PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO t1 VALUES (NULL),(NULL);
CREATE TABLE t2 LIKE t1;
BEGIN;
connection con1;
BEGIN;
DELETE FROM t2;
connection default;
LOCK TABLE t2 READ;;
connection con1;
SET innodb_lock_wait_timeout= 1, lock_wait_timeout= 2;
INSERT INTO t2 SELECT * FROM t1;
COMMIT;
connection default;
UNLOCK TABLES;
DROP TABLE t1, t2;
#
# MDEV-16709 InnoDB: Error: trx already had an AUTO-INC lock
#
CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=InnoDB
PARTITION BY key (pk) PARTITIONS 2;
CREATE TABLE t2 (a INT) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1),(2),(3),(4),(5),(6);
CREATE TABLE t3 (b INT) ENGINE=InnoDB;
INSERT INTO t3 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9);
connection con1;
INSERT t1 SELECT NULL FROM t2;
connection default;
INSERT t1 SELECT NULL FROM t3;
connection con1;
disconnect con1;
connection default;
DROP TABLE t1, t2, t3;
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