75 lines
1.4 KiB
Plaintext
75 lines
1.4 KiB
Plaintext
set global innodb_table_locks=1;
|
|
select @@innodb_table_locks;
|
|
@@innodb_table_locks
|
|
1
|
|
drop table if exists t1;
|
|
set @@innodb_table_locks=1;
|
|
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
|
|
set autocommit=0;
|
|
lock table t1 write;
|
|
update t1 set x=1 where id = 0;
|
|
select * from t1;
|
|
id x
|
|
0 1
|
|
commit;
|
|
update t1 set x=2 where id = 0;
|
|
commit;
|
|
unlock tables;
|
|
select * from t1;
|
|
id x
|
|
0 2
|
|
commit;
|
|
drop table t1;
|
|
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
|
|
set autocommit=0;
|
|
set @@innodb_table_locks=0;
|
|
lock table t1 write;
|
|
update t1 set x=10 where id = 2;
|
|
SELECT * from t1 where id = 2;
|
|
id x
|
|
2 2
|
|
UPDATE t1 set x=3 where id = 2;
|
|
commit;
|
|
SELECT * from t1;
|
|
id x
|
|
0 0
|
|
1 1
|
|
2 3
|
|
commit;
|
|
unlock tables;
|
|
commit;
|
|
select * from t1;
|
|
id x
|
|
0 0
|
|
1 1
|
|
2 10
|
|
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...
|
|
#
|
|
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);
|
|
BEGIN;
|
|
INSERT IGNORE INTO t1 VALUES(3,23);
|
|
SELECT * FROM t1 FOR UPDATE;
|
|
COMMIT;
|
|
a b
|
|
3 1
|
|
COMMIT;
|
|
DROP TABLE t1;
|