mysql 死锁问题

关闭自动提交:

autocommit=0;

SESSION A:

Database changed
mysql> select * from ProductQuota;
+-----------+-------------+
| productSn | frozenQuota |
+-----------+-------------+
|       200 |         100 |
+-----------+-------------+
1 row in set (0.00 sec)

mysql> select * from test;
+----+------+
| id | name |
+----+------+
|  1 | a    |
+----+------+
1 row in set (0.00 sec)

mysql> update ProductQuota  set frozenQuota='200' where productSn=200;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update test set name='b' where id=1;
---hang



SESSION B:


mysql>  update test set name='b' where id=1;
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> update ProductQuota  set frozenQuota='200' where productSn=200;
ERROR 1213 (40001): Deadlock found when trying to get lock; try restarting transaction