CBO not picking the right execution plan

Database: Oracle 9.2.0.6 EE
OS:Solaris 9
I am trying to tune a query that is generated via Siebel Analytics. I am seeing a behaviour which is puzzling me but hopefully would be 'elementary' for someone like JPL.
The query is based on a total of 7 tables. If I comment out any 2 dimension tables, the query picks up the right index on the fact table. However, the moment I add another table to the query, the plan goes awry.
The query with 5 tables is as below:
select count(distinct decode( T30256.HEADER_FLG , 'N' , T30256.ROW_WID ) ) as c1,
T352305.DAY_DT as c2,
case when T44643.PRODUCT_CLASS_NAME = 'MobileSubscription' then T40081.ATTR15_CHAR_VAL else 'Unspecified' end as c3,
T352305.ROW_WID as c5
from
               W_PRODUCT_D T30955,
               W_PRDATTRNM_D T44643,
               W_DAY_D T352305,
               W_ORDERITEM_F T30256,
               W_PRDATTR_D T40081
where ( T30955.ROW_WID = T44643.ROW_WID
and T30256.LAST_UPD_DT_WID = T352305.ROW_WID
and T30256.PROD_ATTRIB_WID = T40081.ROW_WID
and T30256.PROD_WID = T30955.ROW_WID
and T30955.PROD_NAME = 'Mobile Subscription'
and (case when T44643.PRODUCT_CLASS_NAME = 'MobileSubscription' then T40081.ATTR15_CHAR_VAL else 'Unspecified' end in ('BT150BB-18M', 'BT250BB-18M', 'BT50BB-18M', 'BT600BB-18M'))
and T352305.DAY_DT between TO_DATE('2008-09-27' , 'YYYY-MM-DD') - 7 and TO_DATE('2008-09-27' , 'YYYY-MM-DD') - 1
group by
T352305.ROW_WID, T352305.DAY_DT,
case when T44643.PRODUCT_CLASS_NAME = 'MobileSubscription' then T40081.ATTR15_CHAR_VAL else 'Unspecified' end
;And the execution plan is as below:
| Id | Operation                        | Name                | Rows | Bytes | Cost (%CPU)|
|   0 | SELECT STATEMENT                 |                      |   269 | 25824 | 18660   (3)|
|   1 | SORT GROUP BY                   |                      |   269 | 25824 | 18660   (3)|
|   2 |   NESTED LOOPS                   |                      |   269 | 25824 | 18658   (3)|
|   3 |    NESTED LOOPS                  |                      | 6826 |   579K| 4734   (3)|
|   4 |     MERGE JOIN CARTESIAN         |                      |     8 |   544 |     6 (17)|
|   5 |      NESTED LOOPS                |                      |     1 |    54 |     4 (25)|
|   6 |       TABLE ACCESS BY INDEX ROWID| W_PRODUCT_D          |     1 |    37 |     3 (34)|
|* 7 |        INDEX RANGE SCAN          | W_PRODUCT_D_M2       |     1 |       |     2 (50)|
|   8 |       TABLE ACCESS BY INDEX ROWID| W_PRDATTRNM_D        |     1 |    17 |     2 (50)|
|* 9 |        INDEX UNIQUE SCAN         | W_PRDATTRNM_D_P1     |     1 |       |            |
| 10 |      BUFFER SORT                 |                      |     8 |   112 |     4   (0)|
| 11 |       TABLE ACCESS BY INDEX ROWID| W_DAY_D              |     8 |   112 |     3 (34)|
|* 12 |        INDEX RANGE SCAN          | W_DAY_D_M39          |     8 |       |     2 (50)|
| 13 |     TABLE ACCESS BY INDEX ROWID | W_ORDERITEM_F        |   849 | 16131 |   592   (3)|
|* 14 |      INDEX RANGE SCAN            | W_ORDERITEM_F_INDX9 |   852 |       |     4 (25)|
|* 15 |    INDEX RANGE SCAN              | W_PRDATTR_D_M29_T1   |     1 |     9 |     3 (34)|
----------------------------------------------------------------------------------------------Note how the dimension tables W_PRODUCT_D & W_DAY_D are joined using cartesian join before joining to the fact table W_ORDERITEM_F using the composite index 'W_ORDERITEM_F_INDX9'. This index consists of LAST_UPD_DT_WID, PROD_WID and ACTION_TYPE_WID, which are foreign keys to the dimension tables.
Now if I add one more table to the query:
select count(distinct decode( T30256.HEADER_FLG , 'N' , T30256.ROW_WID ) ) as c1,
              T352305.DAY_DT as c2,
               case when T44643.PRODUCT_CLASS_NAME = 'MobileSubscription' then T40081.ATTR15_CHAR_VAL else 'Unspecified' end as c3,
               T30371.X_BT_DLR_GROUP as c4,
               T352305.ROW_WID as c5
          from                W_PRODUCT_D T30955,
               W_PRDATTRNM_D T44643,
               W_DAY_D T352305,
               W_ORDERITEM_F T30256,
               W_ORDER_D T30371,
               W_PRDATTR_D T40081
          where ( T30955.ROW_WID = T44643.ROW_WID
          and T30256.LAST_UPD_DT_WID = T352305.ROW_WID
          and T30256.PROD_ATTRIB_WID = T40081.ROW_WID
          and T30256.PROD_WID = T30955.ROW_WID
          and T30256.ORDER_WID = T30371.ROW_WID
          and T30955.PROD_NAME = 'Mobile Subscription'
          and T30371.STATUS_CD = 'Complete'
          and T30371.ORDER_TYPE = 'Sales Order'
          and (case when T44643.PRODUCT_CLASS_NAME = 'MobileSubscription' then T40081.ATTR15_CHAR_VAL else 'Unspecified' end in ('BT150BB-18M', 'BT250BB-18M', 'BT50BB-18M', 'BT600BB-18M'))
          and T352305.DAY_DT between TO_DATE('2008-09-27' , 'YYYY-MM-DD') - 7 and TO_DATE('2008-09-27' , 'YYYY-MM-DD') - 1
          group by T30371.X_BT_DLR_GROUP, T352305.ROW_WID, T352305.DAY_DT,
          case when T44643.PRODUCT_CLASS_NAME = 'MobileSubscription' then T40081.ATTR15_CHAR_VAL else 'Unspecified' end;I have added a single table W_ORDER_D to the query, and the execution plan is:
| Id | Operation                          | Name               | Rows | Bytes | Cost (%CPU)|
|   0 | SELECT STATEMENT                   |                     |    44 | 6336 | 78695   (3)|
|   1 | SORT GROUP BY                     |                     |    44 | 6336 | 78695   (3)|
|   2 |   NESTED LOOPS                     |                     |    44 | 6336 | 78694   (3)|
|   3 |    NESTED LOOPS                    |                     |   269 | 27707 | 78145   (3)|
|* 4 |     HASH JOIN                      |                     | 6826 |   626K| 64221   (3)|
|   5 |      TABLE ACCESS BY INDEX ROWID   | W_DAY_D             |     8 |   112 |     4 (25)|
|* 6 |       INDEX RANGE SCAN             | W_DAY_D_M39         |     1 |       |     3 (34)|
|   7 |      TABLE ACCESS BY INDEX ROWID   | W_ORDERITEM_F       | 86886 | 2206K| 64197   (3)|
|   8 |       NESTED LOOPS                 |                     | 87004 | 6797K| 64200   (3)|
|   9 |        NESTED LOOPS                |                     |     1 |    54 |     4 (25)|
| 10 |         TABLE ACCESS BY INDEX ROWID| W_PRODUCT_D         |     1 |    37 |     3 (34)|
|* 11 |          INDEX RANGE SCAN          | W_PRODUCT_D_M2      |     1 |       |     2 (50)|
| 12 |         TABLE ACCESS BY INDEX ROWID| W_PRDATTRNM_D       |     1 |    17 |     2 (50)|
|* 13 |          INDEX UNIQUE SCAN         | W_PRDATTRNM_D_P1    |     1 |       |            |
|* 14 |        INDEX RANGE SCAN            | W_ORDERITEM_F_N6    | 86886 |       |   212 (18)|
|* 15 |     INDEX RANGE SCAN               | W_PRDATTR_D_M29_T1 |     1 |     9 |     3 (34)|
|* 16 |    INDEX RANGE SCAN                | W_ORDER_D_N6        |     1 |    41 |     3 (34)|
-----------------------------------------------------------------------------------------------Now CBO doesn't choose the composite index and the cost also has increased to 78695. But if I simply add an /*+ORDERED*/ hint to the above query, so that it should join the dimension tables before joining to fact table, then the cost drops to 20913. This means that CBO is not choosing the plan with the lowest cost. I tried increasing the optimizer_max_permutations to 80000, setting session level optimizer_dynamic_sampling to 8 (just to see if it works), but no success.
Could you please advise how to overcome this problem?
Many thanks.

joshic wrote:
Database: Oracle 9.2.0.6 EE
OS:Solaris 9
I am trying to tune a query that is generated via Siebel Analytics. I am seeing a behaviour which is puzzling me but hopefully would be 'elementary' for someone like JPL.
The query is based on a total of 7 tables. If I comment out any 2 dimension tables, the query picks up the right index on the fact table. However, the moment I add another table to the query, the plan goes awry.
I have added a single table W_ORDER_D to the query, and the execution plan is:
Now CBO doesn't choose the composite index and the cost also has increased to 78695. But if I simply add an /*+ORDERED*/ hint to the above query, so that it should join the dimension tables before joining to fact table, then the cost drops to 20913. This means that CBO is not choosing the plan with the lowest cost. I tried increasing the optimizer_max_permutations to 80000, setting session level optimizer_dynamic_sampling to 8 (just to see if it works), but no success.Back to the original question:
* Can you force the index usage of the composite index on W_ORDERITEM_F in the second query using an INDEX hint (instead of the ORDERED hint)? If yes, what does the plan look like, particularly what cost is reported?
* Could you post the plans including the "Predicate Information" section below the plan output?
* What is the definition of the index W_ORDERITEM_F_N6 on W_ORDERITEM_F?
* Are the cardinalities reported in the execution plans close to reality or way off? The best way to verify this would be to run your query with SQL tracing enabled and generate a tkprof output. If you do so please post the tkprof output here as well.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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Hi Blusky ,
check the below given link.
http://help.sap.com/saphelp_nw04/Helpdata/EN/ec/0d0e405c538f5ce10000000a155106/frameset.htm
Regards,
Rohit Garg

I try to insert some images on a website but the images are not in the right color mode. I do not know what to do? and also I have 1200 images to insert so I can not change one after one. So I need to set up an action, but I donot know how to do it... Tha

I try to insert some images on a website but the images are not in the right color mode. I do not know what to do? and also I have 1200 images to insert so I can not change one after one. So I need to set up an action, but I donot know how to do it... Thanks

What is the problem specifiaclly?
If the images are intended for web use I would recommend converting them to sRGB which could be done with Edit > Convert to Profile or with File > Save for Web, but as including a Save step in Actions and applying them as Batch can sometimes cause problems I would go with regular converting.
You could also try Image Processor Pro.
Scripts Page

Problem: While creating a project in iDVD, it plays perfectly on the computer, but after burning the sound is off. Video soundtrack is not in the right place. HELP!

Problem: While creating a project in iDVD, it plays perfectly on the computer, but after burning the sound is off. Video soundtrack is not in the right place. HELP!

Have you checked out the topics at the right in the More Like This section?
OT

File Adapter as Sender not picking the files

We configured the File Adapter as Sender, Transport Protocol =NSF and message protocol as FCC.
In OS we have folder to read the file, but SAP XI unable to read the file.
To trouble shoot this issue we copied that file into another location and reverted back to the same location then XI File adaptor is able to read the file.
Now we have compared the Attributes of the path
the only difference in file attributes
Coded character set ID . . . . . . . . :   819
CCSID 819 (decimal)
0333 (hex)
Name ISO 8859-1 ASCII
Description ISO 8859-1: Latin Alphabet Number 1Latin-1 countries and regions
Notes Related CCSID with euro is 923
able to read the file attributes:
Coded character set ID . . . . . . . . :   1252
CCSID 1252 (decimal)
04E4 (hex)
Name MS-WIN LATIN-1
SC Co-existence/Migration
FMS Subset
Registration Date
Description MS Windows, Latin-1
Notes CCSID for this code page with euro is 5348
We have tried to chage the File type as Text and File Encoding with ISO-8859-1even then its not picking the files.
Please suggest me where i am doing wrong here
Thanks,
Venkat.

Hi,
Check the file path & file name , Check the processing mode parameter which you have set?
Check the folder properties & provide all the permission ...
Finally check the communication channel status in RWB, If the problem persist try to stop & start the communication channel again..
Hope it helps...
Regards,
Kumar.

CBO not picking the right execution plan

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