List partitioning multi-org tables

Hi
I am doing list partitioning on receivables multi-org tables on org_id column. Running into a performance problem with multi org views. The multi-org views for receivables tables are defined like below with a nvl condition on org_id (partitioned column) in their where clause
create or replace ra_customer_trx
select select * from ra_customer_trx_all
WHERE NVL(ORG_ID,NVL(TO_NUMBER(DECODE(SUBSTRB(USERENV ('CLIENT_INFO'),1,1), ' ', NULL, SUBSTRB(USERENV ('CLIENT_INFO'),1,10))),-99)) = NVL(TO_NUMBER(DECODE(SUBSTRB(USERENV ('CLIENT_INFO'),1,1), ' ', NULL, SUBSTRB(USERENV ('CLIENT_INFO'),1,10))),-99)
Queries against the view are doing all partition scan when I exptected partition pruning to kick in and the query goes only against the spefific partition.
select count(1) from ra_customer_trx ---- does all partition scan
select count(1) from ra_customer_trx_all where org_id = <> ---- does single partition scan, works well.
When I recreate the view with out any function calls on the org_id column partition pruning happens.
In a non partitioned environment which has an index on org_id column, both the above sqls use the index and yield same result.
So my questions are -
1. Is there a way to get around this problem without having to modify the oracle supplied multi-org views? Any options I can supply in the partition script?
2. In a non-partitioned env, with an index on org_id how is the optmizer able to go against the index and where as it is not able to in partitioned environment..? Both these envs has the same view definition with NVL(org.......) consition.
Does anyone have any suggestions?
Thank you.

user2317378 wrote:
1. Is there a way to get around this problem without having to modify the oracle supplied multi-org views? Any options I can supply in the partition script?You mean to say that the expression used in the view belongs to some Oracle supplied schema, like APPS? Or is this a view you've created yourself?
Can you show us the output of EXPLAIN PLAN using DBMS_XPLAN.DISPLAY when querying the view? Use the \ tag before and after to use proper formatting in fixed font.
Please make sure that the "Predicate Information" section below the plan is also included in your post. If it is missing your plan table is old and needs to be upgraded using $ORACLE_HOME/rdbms/admin/utlxplan.sql or dropped if you're in 10g which provides a system wide PLAN_TABLE.
2. In a non-partitioned env, with an index on org_id how is the optmizer able to go against the index and where as it is not able to in partitioned environment..? Both these envs has the same view definition with NVL(org.......) consition.
These are two different questions. One is about partition pruning not taking place, the other one about an index not being used.
Can you show us the output of EXPLAIN PLAN using DBMS_XPLAN.DISPLAY when querying the unpartitioned example? Use the \ tag before and after to use proper formatting in fixed font.
Please make sure that the "Predicate Information" section below the plan is also included in your post. If it is missing your plan table is old and needs to be upgraded using $ORACLE_HOME/rdbms/admin/utlxplan.sql or dropped if you're in 10g which provides a system wide PLAN_TABLE.
It would be interesting to know how Oracle can use the index given the complex expression in the WHERE clause.
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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