How to use and edit Outlines

Can somebody provide me some information on how to edit and create Outlines in 11g? I have a case where we are using a third party tool whose generated SQL we can't control and it is generating a query that is incredibly slow due to the optimizer's choice of an index to use. Since we can't add a hint to the query, my understanding is that I should use stored Outlines. I can see how to create one but I am unclear as to how to add a "NO_INDEX" hint / how to tell it not to use and index. Can anybody provide me help on how to do this?
Thanks,
Greg

1. SQL profile is not an alternative to stored outline. Oracle implemented SQL plan baseline as an alternative to stored outline.
2. Stored outline can be used as an way of chaning execution plan without modifying the origincal SQL text(OP seems to find the way of doing this, am I right?).
I call it "switching outline".
See following test case which demonstrate how to use stored outline to fix execution plan without chaning SQL text.
UKJA@ukja102> -- create objects
UKJA@ukja102> drop table t1 purge;
Table dropped.
Elapsed: 00:00:00.12
UKJA@ukja102>
UKJA@ukja102> create table t1(c1 int, c2 int);
Table created.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> create index t1_n1 on t1(c1);
Index created.
Elapsed: 00:00:00.03
UKJA@ukja102> create index t1_n2 on t1(c2);
Index created.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> insert into t1
2 select level, level
3 from dual
4 connect by level <= 1000
5 ;
1000 rows created.
Elapsed: 00:00:00.04
UKJA@ukja102>
UKJA@ukja102> exec dbms_stats.gather_table_stats(user, '&1', no_invalidate=>false);
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.42
UKJA@ukja102>
UKJA@ukja102>
UKJA@ukja102> --------------------------------------------------
UKJA@ukja102> -- case1: switching outline
UKJA@ukja102>
UKJA@ukja102> -- this is "current" plan
UKJA@ukja102> explain plan for
2 select /*+ full(t1) */
3    *
4 from t1
5 where c1 = 1 or c2 = 2
6 ;
Explained.
Elapsed: 00:00:00.04
UKJA@ukja102>
UKJA@ukja102> @plan
UKJA@ukja102> select * from table(dbms_xplan.display)
2 /
PLAN_TABLE_OUTPUT
Plan hash value: 3617692013
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      |     2 |    14 |     3   (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| T1   |     2 |    14 |     3   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter("C1"=1 OR "C2"=2)
13 rows selected.
Elapsed: 00:00:00.14
UKJA@ukja102>
UKJA@ukja102> -- want to change to this
UKJA@ukja102> explain plan for
2 select /*+ use_concat */
3    *
4 from t1
5 where c1 = 1 or c2 = 2
6 ;
Explained.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> @plan
UKJA@ukja102> select * from table(dbms_xplan.display)
2 /
PLAN_TABLE_OUTPUT
Plan hash value: 82564388
| Id | Operation                    | Name | Rows | Bytes | Cost (%CPU)| Time
     |
|   0 | SELECT STATEMENT             |       |     2 |    14 |     4   (0)| 00:0
0:01 |
|   1 | CONCATENATION               |       |       |       |            |
     |
|   2 |   TABLE ACCESS BY INDEX ROWID| T1    |     1 |     7 |     2   (0)| 00:0
0:01 |
|* 3 |    INDEX RANGE SCAN          | T1_N2 |     1 |       |     1   (0)| 00:0
0:01 |
|* 4 |   TABLE ACCESS BY INDEX ROWID| T1    |     1 |     7 |     2   (0)| 00:0
0:01 |
|* 5 |    INDEX RANGE SCAN          | T1_N1 |     1 |       |     1   (0)| 00:0
0:01 |
Predicate Information (identified by operation id):
   3 - access("C2"=2)
   4 - filter(LNNVL("C2"=2))
   5 - access("C1"=1)
19 rows selected.
Elapsed: 00:00:00.04
UKJA@ukja102>
UKJA@ukja102> -- create "bad" outline
UKJA@ukja102> create or replace outline test_outln1
2 on
3 select /*+ full(t1) */
4    *
5 from t1
6 where c1 = 1 or c2 = 2
7 ;
Outline created.
Elapsed: 00:00:00.18
UKJA@ukja102>
UKJA@ukja102>
UKJA@ukja102> -- create "good" outline
UKJA@ukja102> create or replace outline test_outln2
2 on
3 select /*+ use_concat */
4    *
5 from t1
6 where c1 = 1 or c2 = 2
7 ;
Outline created.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> -- check outline
UKJA@ukja102> select hint
2 from user_outline_hints
3 where name = 'TEST_OUTLN2'
4 ;
HINT
INDEX(@"SEL$1_2" "T1"@"SEL$1_2" ("T1"."C1"))
INDEX(@"SEL$1_1" "T1"@"SEL$1" ("T1"."C2"))
OUTLINE(@"SEL$1")
OUTLINE_LEAF(@"SEL$1_2")
USE_CONCAT(@"SEL$1" 8)
OUTLINE_LEAF(@"SEL$1_1")
OUTLINE_LEAF(@"SEL$1")
ALL_ROWS
OPTIMIZER_FEATURES_ENABLE('10.2.0.1')
IGNORE_OPTIM_EMBEDDED_HINTS
10 rows selected.
Elapsed: 00:00:00.11
UKJA@ukja102>
UKJA@ukja102>
UKJA@ukja102> -- update outline
UKJA@ukja102> update outln.ol$
2 set hintcount = (
3    select hintcount
4    from outln.ol$
5    where ol_name = 'TEST_OUTLN2')
6 where
7    ol_name = 'TEST_OUTLN1'
8 ;
1 row updated.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> delete from outln.ol$hints
2 where ol_name = 'TEST_OUTLN1'
3 ;
5 rows deleted.
Elapsed: 00:00:00.00
UKJA@ukja102>
UKJA@ukja102> update outln.ol$hints
2 set ol_name = 'TEST_OUTLN1'
3 where ol_name = 'TEST_OUTLN2'
4 ;
10 rows updated.
Elapsed: 00:00:00.03
UKJA@ukja102>
UKJA@ukja102> delete from outln.ol$nodes
2 where ol_name = 'TEST_OUTLN1'
3 ;
1 row deleted.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> update outln.ol$nodes
2 set ol_name = 'TEST_OUTLN1'
3 where ol_name = 'TEST_OUTLN2'
4 ;
3 rows updated.
Elapsed: 00:00:00.01
UKJA@ukja102>
UKJA@ukja102> commit;
Commit complete.
Elapsed: 00:00:00.00
UKJA@ukja102>
UKJA@ukja102> -- see that stored outline is used in explain plan
UKJA@ukja102> alter session set use_stored_outlines = true;
Session altered.
Elapsed: 00:00:00.04
UKJA@ukja102>
UKJA@ukja102> explain plan for
2 select /*+ full(t1) */
3    *
4 from t1
5 where c1 = 1 or c2 = 2
6 ;
Explained.
Elapsed: 00:00:00.03
UKJA@ukja102>
UKJA@ukja102> @plan
UKJA@ukja102> select * from table(dbms_xplan.display)
2 /
PLAN_TABLE_OUTPUT
Plan hash value: 82564388
| Id | Operation                    | Name | Rows | Bytes | Cost (%CPU)| Time
     |
|   0 | SELECT STATEMENT             |       |     2 |    14 |     4   (0)| 00:0
0:01 |
|   1 | CONCATENATION               |       |       |       |            |
     |
|   2 |   TABLE ACCESS BY INDEX ROWID| T1    |     1 |     7 |     2   (0)| 00:0
0:01 |
|* 3 |    INDEX RANGE SCAN          | T1_N2 |     1 |       |     1   (0)| 00:0
0:01 |
|* 4 |   TABLE ACCESS BY INDEX ROWID| T1    |     1 |     7 |     2   (0)| 00:0
0:01 |
|* 5 |    INDEX RANGE SCAN          | T1_N1 |     1 |       |     1   (0)| 00:0
0:01 |
Predicate Information (identified by operation id):
   3 - access("C2"=2)
   4 - filter(LNNVL("C2"=2))
   5 - access("C1"=1)
Note
   - outline "TEST_OUTLN1" used for this statement
23 rows selected.
Elapsed: 00:00:00.06
UKJA@ukja102>
UKJA@ukja102> drop outline test_outln1;
Outline dropped.
Elapsed: 00:00:00.04
UKJA@ukja102> drop outline test_outln2;
Outline dropped.================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================
Edited by: Dion_Cho on Jan 29, 2009 8:25 PM
Typo...

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