;
ENAME SAL GRADE
---------- ---------- ----------
SCOTT 3000 4
FORD 3000 4
JONES 2975 4
ADAMS 1100 1
SMITH 800 1
/*------- 执行上述SQL语句后获得其真实的执行计划，使用了iostats last -predicate -note 修饰符控制显示输出-----*/
SQL> set pagesize 0
SQL> select * from table(dbms_xplan.display_cursor(null,null,'iostats last -predicate -note'));
SQL_ID 243b0tpjxj6wv, child number 0
-------------------------------------
select e.ename,e.sal,s.grade from emp e join salgrade s on e.sal between losal and
hisal and e.deptno = 20
Plan hash value: 4204027666
-------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
-------------------------------------------------------------------------------------------
| 1 | MERGE JOIN | | 1 | 1 | 5 |00:00:00.01 | 14 |
| 2 | SORT JOIN | | 1 | 5 | 5 |00:00:00.01 | 7 |
| 3 | TABLE ACCESS FULL | EMP | 1 | 5 | 5 |00:00:00.01 | 7 |
| 4 | FILTER |