如何删除错误的触发器

Question

在Mysql Version 5.0.77上，我运行了这个

CREATE TRIGGER ins_trap_to_memory AFTER INSERT on Table1
FOR EACH ROW 
INSERT INTO Table1_Copy SELECT NEW.*;

它运行了，但是现在每当我尝试做某些事情时数据库都会断开连接：

无法查看触发器 -

mysql> SHOW TRIGGERS LIKE '%'\G
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    7
Current database: mydb

ERROR 2013 (HY000): Lost connection to MySQL server during query

无法删除问题触发器 -

mysql> DROP TRIGGER ins_trap_to_memory;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3

无法查询information_schema.TRIGGERS -

mysql> select * from information_schema.TRIGGERS;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    12
Current database: information_schema

ERROR 2013 (HY000): Lost connection to MySQL server during query

Answer 1

其他类型的查询是否有效？

我认为这两者并不相关，除非Table1持续大量插入，这是服务器过载的结果。它可能只是一个间歇性的连接问题。

无论哪种方式，您都可以使用以下方式删除它：

DROP TRIGGER ins_trap_to_memory ON Table1

Answer 2

能够通过转到/var/lib/mysql/mydb并删除Table1.TRG来消除错误的触发器。