即使MyISAM表格式非常可靠(SQL语句对表做的所有改变在语句返回之前被写下),如果下列任何事件发生,你依然可以获得损坏的表:
? MySQLd进程在写中间被杀掉。
? 发生未预期的计算机关闭(例如,计算机被关闭)。
? 硬件故障。
? 你可以同时在正被服务器修改的表上使用外部程序(如myisamchk)。
? MySQL或MyISAM代码的软件缺陷。
一个损坏的表的典型症状如下:
? 当在从表中选择数据之时,你得到如下错误:
? Incorrect key file for table: '...'. Try to repair it
? 查询不能在表中找到行或返回不完全的数据。
你可以用CHECK TABLE statement语句来检查MyISAM表的健康,并用REPAIR TABLE修复一个损坏的MyISAM表。当mysqld不运行之时,你也可以用myisamchk命令检查或修理一个表。
如果你的表变得频繁损坏,你应该试着确定为什么会这样的原因。要明白的最重要的事是表变得损坏是不是因为服务器崩溃的结果。你可以在错误日志中查找最近的restarted mysqld消息来早期验证这个。如果存在这样一个消息,则表损坏是服务器死掉的一个结果是很有可能的。否则,损坏可能在正常操作中发生。这是一个缺陷。你应该试着创建一个展示这个问题的可重复生成的测试案例。

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