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
|
use test;
drop table if exists t1;
create table t1 (id int primary key, value int, value2 int,
value3 int, index(value,value2)) engine=innodb;
insert into t1 values
(10,10,10,10),(11,11,11,11),(12,12,12,12),(13,13,13,13),(14,14,14,14),
(15,15,15,15),(16,16,16,16),(17,17,17,17),(18,18,18,18),(19,19,19,19),
(20,20,20,20);
connect conn1, localhost, root,,;
connect conn2, localhost, root,,;
connect conn3, localhost, root,,;
connection conn1;
use test;
start transaction with consistent snapshot;
connection conn2;
use test;
CREATE PROCEDURE update_t1()
BEGIN
DECLARE i INT DEFAULT 1;
while (i <= 5000) DO
update test.t1 set value2=value2+1, value3=value3+1 where id=12;
SET i = i + 1;
END WHILE;
END|
set autocommit=0;
CALL update_t1();
select * from t1;
id value value2 value3
10 10 10 10
11 11 11 11
12 12 5012 5012
13 13 13 13
14 14 14 14
15 15 15 15
16 16 16 16
17 17 17 17
18 18 18 18
19 19 19 19
20 20 20 20
set autocommit=1;
select * from t1;
id value value2 value3
10 10 10 10
11 11 11 11
12 12 5012 5012
13 13 13 13
14 14 14 14
15 15 15 15
16 16 16 16
17 17 17 17
18 18 18 18
19 19 19 19
20 20 20 20
connection conn1;
select * from t1 force index(value) where value=12;
connection conn3;
kill query @id;
connection conn1;
ERROR 70100: Query execution was interrupted
connection default;
disconnect conn1;
disconnect conn2;
disconnect conn3;
drop procedure if exists update_t1;
drop table if exists t1;
|
