Oracle生成和显示执行计划的方法(二)
075, SQL hash value: 2096952573, child number: 0
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SELECT ename FROM emp e, dept d WHERE e.deptno = d.deptno
AND e.empno=7369
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
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| 0 | SELECT STATEMENT | | | | | |
|* 1 | HASH JOIN | | 1 | 16 | 6 (34)| 00:00:01 |
|* 2 | TABLE ACCESS FULL| EMP | 1 | 13 | 3 (34)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT | 4 | 12 | 3 (34)| 00:00:01 |
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Predicate Information (identified by operation id):
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1 - access("E"."DEPTNO"="D"."DEPTNO")
2 - filter("E"."EMPNO"=7369)
21 rows selected.
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还可以用下面的方式获得SQL_ID和CHILD_NUMBER
SELECT /* TOTO */ ename, dname
FROM dept d join emp e USING (deptno);
用上面的语句得到 sql_id和child_number:
SELECT sql_id, child_number
FROM v$sql
WHERE sql_text LIKE '%TOTO%';
SQL_ID CHILD_NUMBER
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gwp663cqh5qbf 0
SELECT * FROM table(DBMS_XPLAN.DISPLAY_CURSOR(('gwp663cqh5qbf',0));
Plan hash value: 3693697075, SQL ID: gwp663cqh5qbf, child number: 0
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SELECT /* TOTO */ ename, dname
FROM dept d JOIN emp e USING (deptno);
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| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 7 (100)| |
| 1 | SORT GROUP BY | | 4 | 64 | 7 (43)| 00:00:01 |
|* 2 | HASH JOIN | | 14 | 224 | 6 (34)| 00:00:01 |
| 3 | TABLE ACCESS FULL| DEPT | 4 | 44 | 3 (34)| 00:00:01 |
| 4 | TABLE ACCESS FULL| EMP | 14 | 70 | 3 (34)| 00:00:01 |
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Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("E"."DEPTNO"="D"."DEPTNO")
上边的两步还可以用下面的方法一次性得到
SELECT t.*
FROM v$sql s, table(DBMS_XPLAN.DISPLAY_CURSOR(s.sql_id, s.child_number)) t WHERE sql_text LIKE '%TOTO%';