查询表锁争用情况 table_locks_waited & table_locks_immedaite

• 可以通过检查table_locks_waited和table_locks_immediate状态变量来分析系统上的表锁定争夺
• 如果table_locks_waited值比较高，则说明表级锁争用比较严重

mysql> show status like 'table%';
+-----------------------+---------+
| Variable_name         | Value   |
+-----------------------+---------+
| Table_locks_immediate | 3544190 |
| Table_locks_waited    | 0       |
+-----------------------+---------+
2 rows in set (0.00 sec)