开启Query Cache导致的一个报错

今天报警一条error：host xxxx has more lowmem_prunes,please add Memory...

这个报警是一个shell脚本写的

Qcache_lowmem_prunes=`$Procedure_source -h$host -P$Port -uadmin  -pxxxx -e"show status" | grep "Qcache_lowmem_prunes" | awk '{print $2}'`if [ $Qcache_lowmem_prunes -gt 700000000 ]   thenecho "$host has more lowmem_prunes,please add Memory" | mail -s "$host has more lowmem_prunes,now lowmem_prunes is $Qcache_lowmem_prunes `date +"%R %F"`"  $maillist   elseecho "$host lowmem_prunes ok"fi

官方文档对 Qcache_lowmem_prunes的解释：

The number of queries that were deleted from the query cache because of low memory.

大概意思是cache池满了，所以导致的query修剪。

结合下面两篇文章，做了如下决定：改my.cnf文件，query_cache_type=1->0 query_cache_size=1G->0

务必重启

参考：http://t.cn/RAF4d7z http://t.cn/RAF4d7Z