-----
select /* outlinetest2 */ /*+ full(dh_stat) */ * from d 3fcq9c8xu4a92 1000483106 0
h_stat where id=771
SQL> alter session set use_stored_outlines=true;
会话已更改。
SQL> select * from table(dbms_xplan.display_cursor('3fcq9c8xu4a92','',''));
PLAN_TABLE_OUTPUT
---------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 3fcq9c8xu4a92, child number 0
-------------------------------------
select /* outlinetest2 */ /*+ full(dh_stat) */ * from dh_stat where
id=771
Plan hash value: 1845196118
-----------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 124 (100)| |
|* 1 | TABLE ACCESS FULL| DH_STAT | 1 | 38 | 124 (1)| 00:00:02 |
-----------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("ID"=771)
已选择19行。
SQL> exec DBMS_OUTLN.create_outline(hash_value=>1000483106,child_number => 0,category=>'TEST');
PL/SQL 过程已成功完成。
SQL> select name,category,used,sql_text from dba_outlines;
NAME CATEGORY USED SQL_TEXT
------------------------------ ---------- ------ -------------------------------------------------------
SYS_OUTLINE_14061210153067004 TEST UNUSED select /* outlinetest2 */ /*+ full(dh_stat) */ * from d
h_stat where id=771
SYS_OUTLINE_14061209594622403 TEST UNUSED select /* outlinetest1 */ * from dh_stat where id=771
可以看到，我们新建的outline，确实已经成功
SQL> alter session set use_stored_outlines=TEST;
会话已更改。
SQL> select /* outlinetest1 */ * from dh_stat where id=771;
ID NAME TYPE
---------- ------------------------------ ---------------
771 APPLY$_CONF_HDLR_COLUMNS_UNQ1 INDEX
SQL> select /* outlinetest2 */ /*+ full(dh_stat) */ * from dh_stat where id=771;
ID NAME TYPE
---------- ------------------------------ ---------------
771 APPLY$_CONF_HDLR_COLUMNS_UNQ1 INDEX
SQL> select name,category,used,sql_text from dba_outlines;
NAME CATEGORY USED SQL_TEXT
------------------------------ ---------- ------ -------------------------------------------------------
SYS_OUTLINE_14061210153067004 TEST USED select /* outlinetest2 */ /*+ full(dh_stat) */ * from d
h_stat where id=771
SYS_OUTLINE_14061209594622403 TEST USED select /* outlinetest1 */ * from dh_stat where id=771
可以看到，两个outline都已经标记为已经使用过
SQL> select * from table(dbms_xplan.display_cursor('3fcq9c8xu4a92','',''));
PLAN_TABLE_OUTPUT
---------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 3fcq9c8xu4a92, child number 0
-------------------------------------
select /* outlinetest2 */ /*+ full(dh_stat) */ * from dh_stat where
id=771
Plan hash value: 1845196118
-----------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-----------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 124 (100)| |
|* 1 | TABLE ACCESS FULL| DH_STAT | 1 | 38 | 124 (1)| 00:00:02 |
-----------------------------------------------------------------------------
Predic