1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
drop table if exists t1,t2;
connect a,localhost,root,,;
connect b,localhost,root,,;
connection a;
set binlog_format=mixed;
set session transaction isolation level repeatable read;
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
insert into t1 values (1),(2),(3),(4),(5),(6),(7);
set autocommit=0;
select * from t1 where a=3 lock in share mode;
a
3
connection b;
set binlog_format=mixed;
set session transaction isolation level repeatable read;
set autocommit=0;
update t1 set a=10 where a=5;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
commit;
connection a;
commit;
connection b;
set session transaction isolation level read committed;
update t1 set a=10 where a=5;
connection a;
select * from t1 where a=2 for update;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
select * from t1 where a=2 limit 1 for update;
a
2
connection b;
update t1 set a=11 where a=6;
update t1 set a=12 where a=2;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
update t1 set a=13 where a=1;
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
connection a;
commit;
connection b;
update t1 set a=14 where a=1;
commit;
connection a;
select * from t1;
a
14
2
3
4
10
11
7
drop table t1;
connection default;
disconnect a;
disconnect b;
create table t1 (a int, b int) engine=myisam;
create table t2 (c int, d int, key (c)) engine=innodb;
insert into t1 values (1,1);
insert into t2 values (1,2);
connect a,localhost,root,,;
connection a;
set session transaction isolation level read committed;
delete from t1 using t1 join t2 on t1.a = t2.c where t2.d in (1);
connection default;
disconnect a;
drop table t1, t2;
|
