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HomeDatabaseMysql Tutorial[20130919]出现有持续性的Lazy Write

公告 [20130919]出现有持续性的Lazy Write 表现:收到性能告警,LazyWrite严重超标,一般在100以上,正常情况下,LazyWrite为0,但是奇怪的是,当时的Free pages =312190左右,相当于2G空闲空间。OS的可用内存在1G左右,从ring_buffers也没有看到外部内存压

公告

[20130919]出现有持续性的Lazy Write

表现:收到性能告警,,LazyWrite严重超标,一般在100以上,正常情况下,LazyWrite为0,但是奇怪的是,当时的Free pages =312190左右,相当于2G空闲空间。OS的可用内存在1G左右,从ring_buffers也没有看到外部内存压力,下班之后发现,tempdb开辟了一些空间。

原因:出现这个问题的原因,根据每5分钟抓取一次性能值看出,是在一个批量处理数据之后出现的。数据大概120W左右,大概的空间367MB。请教了一个资深DBA,他大概的意思是,大批量数据操作,导致数据页被逐出,现在有需要读取数据页,重新读入,发生LazyWrite。但是有一个地方解释不通的就是有大量的free pages 为什么还会Lazy Write,是否有之后的tempdb开辟了空间有关。是否和tempdb 有关目前还不知。

解决方法:经过一段时间的Lazy Write,自然便的正常

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