SQL> select * from table(dbms_xplan.display_cursor('053nzgm4f6rdr','',''));
PLAN_TABLE_OUTPUT
---------------------------------------------------------------------------------------------------------------------------------------
....此处为了排版，省略了一个child number 0 的执行计划！........ SQL_ID 053nzgm4f6rdr, child number 1
-------------------------------------
select /* outlinetest1 */ * from dh_stat where id=771
Plan hash value: 2780970545
---------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 2 (100)| |
| 1 | TABLE ACCESS BY INDEX ROWID| DH_STAT | 1 | 38 | 2 (0)| 00:00:01 |
|* 2 | INDEX RANGE SCAN | IND_1 | 1 | | 1 (0)| 00:00:01 |
---------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("ID"=771)
Note
-----
- outline "SYS_OUTLINE_14061209594622403" used for this statement
已选择42行。
SQL> alter session set use_stored_outlines=TRUE;

会话已更改。通过如下方式，我们调换两个outline里面的hints
SQL> UPDATE OUTLN.OL$HINTS
2 SET OL_NAME = DECODE(OL_NAME,
3 'SYS_OUTLINE_14061210153067004',
4 'SYS_OUTLINE_14061209594622403',
5 'SYS_OUTLINE_14061209594622403',
6 'SYS_OUTLINE_14061210153067004')
7 WHERE OL_NAME IN ('SYS_OUTLINE_14061210153067004', 'SYS_OUTLINE_14061209594622403');
已更新12行。
SQL> commit;
提交完成。
SQL> col hint_text format a50
SQL> select hint#,hint_text from outln.ol$hints a where ol_name='SYS_OUTLINE_14061209594622403';
HINT# HINT_TEXT
---------- --------------------------------------------------
1 FULL(@"SEL$1" "DH_STAT"@"SEL$1")
2 OUTLINE_LEAF(@"SEL$1")
3 ALL_ROWS
4 DB_VERSION('11.2.0.1')
5 OPTIMIZER_FEATURES_ENABLE('11.2.0.1')
6 IGNORE_OPTIM_EMBEDDED_HINTS
已选择6行。
果然和我们预期的一样，outline里面的执行计划已经调换
SQL> select /* outlinetest1 */ * from dh_stat where id=771;