标签:from cos 执行 创建索引 ima splay explain plain col
explain plan for select * from emp where deptno = 10;
select * from table(dbms_xplan.display);
Cost(%CPU)列数值之和小的,效率高
标签:from cos 执行 创建索引 ima splay explain plain col
原文地址:https://www.cnblogs.com/zsh-wj/p/9389817.html