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
|
-- source include/not_embedded.inc
-- source include/have_innodb.inc
--disable_warnings
drop table if exists t1;
--enable_warnings
# basic tests of semi-consistent reads
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;
# this should lock the entire table
select * from t1 where a=3 lock in share mode;
connection b;
set binlog_format=mixed;
set session transaction isolation level repeatable read;
set autocommit=0;
-- error ER_LOCK_WAIT_TIMEOUT
update t1 set a=10 where a=5;
connection a;
commit;
connection b;
# perform a semi-consisent read (and unlock non-matching rows)
set session transaction isolation level read committed;
update t1 set a=10 where a=5;
connection a;
-- error ER_LOCK_WAIT_TIMEOUT
select * from t1 where a=2 for update;
# this should lock the records (1),(2)
select * from t1 where a=2 limit 1 for update;
connection b;
# semi-consistent read will skip non-matching locked rows a=1, a=2
update t1 set a=11 where a=6;
-- error ER_LOCK_WAIT_TIMEOUT
update t1 set a=12 where a=2;
-- error ER_LOCK_WAIT_TIMEOUT
update t1 set a=13 where a=1;
connection a;
commit;
connection b;
update t1 set a=14 where a=1;
commit;
connection a;
select * from t1;
drop table t1;
connection default;
disconnect a;
disconnect b;
|
