举个栗子:
select * from SCOTT.emp WHERE EMPNO=7369;
方式一:F5,解释计划窗口,查看索引名是否被用
方式二:
1.执行sql语句
select * from SCOTT.emp WHERE EMPNO=7369;
2.将表的索引pk_emp纳入监控
alter index pk_emp monitoring usage;
3.select * from v$object_usage 查看used状态YES/NO,YES即表示有用索引
4.结束监控 alter index pk_emp nomonitoring usage;
方式三:
执行sql语句:explain plan for select * from SCOTT.emp where empno=7369;
select * from table(dbms_xplan.display);