Home Database Mysql Tutorial 给某XXX房地产网优化一例

给某XXX房地产网优化一例

Jun 07, 2016 pm 05:41 PM
limit optimization

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

  • select id,title,createdate from 表名 order by createdate asc limit 334570,10; 
  • 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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