Now we have two indexes for this column (in both directions), so our query will be executed with acceptable performances this time. Notice the following line in the query log

 
  • 现在我们对这一栏有两个索引了(两个顺序),因此查询性能又恢复到了可接受的范围了。注意查询日志中这一行
今日热词
目录 附录 查词历史