给某XXX房地产网优化一例
这是他们开发写的一条SQLselectid,title,createdatefrom表名orderbycreatedateasclimit334570,10;问了那边的人意思是读取最老的新闻标题,从334570行数据读取10.
这是他们开发写的一条SQL
问了那边的人意思是读取最老的新闻标题,从334570行数据读取10条记录。
索引情况如下:
优化器执行如下:
这时想起了高性能第二版的一个优化案例,嘿嘿,正好派上用场了。
先看下这个SQL执行的情况:
这是优化后的:
具体为什么,我这里就不班门弄斧了,美国服务器,请大家看书吧(高性能MySQL第2版),下面是书中的截图:
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