在调用存储过程中,就会涉及到表锁,行锁这一概念:所谓区别:有索引的时候就是行锁,没有索引的时候就是表索。
innodb 的行锁是在有索引的情况下,没有索引的表是锁定全表的.
一、表锁演示(无索引):
Session1:
mysql> set autocommit=0;
mysql> select * from innodb_test; +------+-------------+ | id | name | +------+-------------+ | 1 | woshiceshi | | 2 | woshiceshi2 | | 3 | woshiceshi3 | +------+-------------+
mysql> select * from innodb_test where id = 2 for update; +------+------------+ | id | name | +------+------------+ | 2 | woshiceshi2 | +------+------------+
Session2:
mysql> update innodb_test set name='sjis' where id = 1 ; 处于等待状态....
再回到session1 commit以后,session2就出来结果了(锁定了8秒,过了8秒左右才去session1提交)。
mysql> update innodb_test set name='sjis' where id = 1 ; Query OK, 1 row affected (8.11 sec) Rows matched: 1 Changed: 1 Warnings: 0
实验结果是:我在session1的for update 操作看似只锁定ID为2的行其实锁定了全表,以至于后面session2的对ID为1的行update 需要等待Session1锁的释放。
二、行锁演示(索引为ID)
Session1:mysql> alter table innodb_test add index idx_id(id); Query OK, 4 rows affected (0.01 sec) Records: 4 Duplicates: 0 Warnings: 0mysql> select * from innodb_test where id = 2 for update; +------+------------+ | id | name | +------+------------+ | 2 | woshiceshi2 | +------+------------+
Session2:
mysql> update innodb_test set name='wohaishiceshi' where id = 1 ; Query OK, 1 row affected (0.02 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from innodb_test where id = 1; +------+---------------+ | id | name | +------+---------------+ | 1 | wohaishiceshi | +------+---------------+ 1 row in set (0.00 sec)
实验结果:这次的锁定是锁定的行,所以没有被锁定的行(ID不为2的行)可以进行update..
参考链接:https://blog.csdn.net/songwei128/article/details/43418343