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1
by brian
clean slate |
1 |
drop table if exists t1;
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set session transaction isolation level read committed;
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3 |
create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
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insert into t1 values (1),(2),(3),(4),(5),(6),(7);
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5 |
set autocommit=0;
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6 |
select * from t1 where a=3 lock in share mode;
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7 |
a
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8 |
3
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9 |
set session transaction isolation level read committed;
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10 |
set autocommit=0;
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11 |
update t1 set a=10 where a=5;
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12 |
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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13 |
commit;
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14 |
update t1 set a=10 where a=5;
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15 |
select * from t1 where a=2 for update;
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16 |
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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17 |
select * from t1 where a=2 limit 1 for update;
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18 |
a
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19 |
2
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20 |
update t1 set a=11 where a=6;
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21 |
update t1 set a=12 where a=2;
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22 |
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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23 |
update t1 set a=13 where a=1;
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24 |
ERROR HY000: Lock wait timeout exceeded; try restarting transaction
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25 |
commit;
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26 |
update t1 set a=14 where a=1;
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27 |
commit;
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28 |
select * from t1;
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29 |
a
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30 |
14
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31 |
2
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32 |
3
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33 |
4
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34 |
10
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35 |
11
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36 |
7
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37 |
drop table t1;
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