mysql 设置查询缓存
查询缓存绝不返回过期数据。当数据被修改后，在查询缓存中的任何相关词条均被转储清除。
可将如下语句query_cache_size = 268435456
query_cache_type = 1
query_cache_limit = 1048576
存放到/etc/my.cnf文件的[mysqld]下
然后重启mysql数据库
service mysqld restart
就会启动mysql的缓存机制Query Cache。 在使用中，查询缓存会存储一个 SELECT 查询的文本与被传送到客户端的相应结果。
如果之后接收到一个同样的查询，服务器将从查询缓存中检索结果，而不是再次分析和执行这个同样的查询。
注意：查询缓存绝不返回过期数据。当数据被修改后，在查询缓存中的任何相关词条均被转储清除。
适用于更改不是太频繁的表且有大量相同查询的情况
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