mysql 有索引沒走索引 更新鎖全表
阿新 • • 發佈:2019-02-19
Session 1: mysql> select connection_id(); +-----------------+ | connection_id() | +-----------------+ | 2 | +-----------------+ 1 row in set (0.00 sec) mysql> start transaction; Query OK, 0 rows affected (0.00 sec) mysql> select * from t200 where phoneNo between 30 and 40 for update; +----+---------+-------------+--------+ | sn | phoneNo | channelType | status | +----+---------+-------------+--------+ | 30 | 30 | 2 | 1 | | 34 | 34 | 3 | 2 | | 39 | 39 | 3 | 2 | +----+---------+-------------+--------+ 3 rows in set (0.00 sec) mysql> select @@tx_isolation; +-----------------+ | @@tx_isolation | +-----------------+ | REPEATABLE-READ | +-----------------+ 1 row in set (0.00 sec) mysql> explain select * from t200 where phoneNo between 30 and 40 for update; +----+-------------+-------+------+---------------+------+---------+------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+------+-------------+ | 1 | SIMPLE | t200 | ALL | t200_idx1 | NULL | NULL | NULL | 34 | Using where | +----+-------------+-------+------+---------------+------+---------+------+------+-------------+ Session 2: mysql> insert into t200 values(29,29,4,1); ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction mysql> insert into t200 values(100,100,4,1); ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction mysql> insert into t200 values(1000,1000,4,1); ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction mysql> insert into t200 values(1000,1000,4,1);