Re: Query Tuning Help

From: Finn Jorgensen <finn.oracledba_at_gmail.com>
Date: Wed, 31 Oct 2007 10:58:51 -0500
Message-ID: <74f79c6b0710310858t26ba0a6t281b8b610fd434eb@mail.gmail.com>

The biggest problem for this query is that the IN results in a FILTER operation, which is very slow, and I'm guessing the inner "MINUS" query returns a lot of rows.

I'm guessing there's no index on "guid" in call_detail?

Try this version (it's hard tuning queries without access to the database so a little testing can be done) :

SELECT /*+ parallel(a,10) use_hash(a b) */

         billing_act_nbr, final_tg_nbr, COUNT(*), SUM (call_duration_value),
         SUM (rated_cost_amt)
    FROM cdrw.call_detail a,
(            SELECT
                   guid
              FROM cdrw.call_detail c
             WHERE orig_dt >= TO_DATE ('20071016000000', 'yyyymmddhh24miss')
               AND orig_dt < TO_DATE ('20071016010000', 'yyyymmddhh24miss')
                        AND (record_typ='STOP' OR call_duration_value>0)
            MINUS
            SELECT
                   guid
              FROM cdrw.call_detail_cost_vero d
             WHERE orig_dt >= TO_DATE ('20071016000000', 'yyyymmddhh24miss')
               AND orig_dt < TO_DATE ('20071016010000', 'yyyymmddhh24miss'))

b

    WHERE orig_dt >= TO_DATE ('20071016000000', 'yyyymmddhh24miss')

               AND orig_dt < TO_DATE ('20071016010000', 'yyyymmddhh24miss')
                        AND (record_typ='STOP' OR call_duration_value>0)
     AND a.guid = b.guid

GROUP BY billing_act_nbr, final_tg_nbr;

Finn

On 10/31/07, A Ebadi <ebadi01_at_yahoo.com> wrote:
>
> We've been trying to tune this query below, but to no avail. The table
> call_detail below is a very large hourly partitioned table with each
> partition being about 2-4GB! The other table (call_detail_cost_vero) is
> relatively small.
>
> The two inner selects with minus runs fine alone in about 6-8 minutes, but
> the entire query doesn't finish even after running it for many hours! We've
> tried running it in parallel/no parallel and hasn't helped. Any
> recommendations would be appreciated. The explain plan is at the bottom of
> this e-mail also.
>
> Thanks,
> Abdul
>
> Environment: Sun Solaris, Oracle 10.2.0.3.0 on RAC (4 node)
>
> SELECT /*+ parallel(a,10) */
> billing_act_nbr, final_tg_nbr, COUNT(*), SUM
> (call_duration_value),
> SUM (rated_cost_amt)
> FROM cdrw.call_detail a
> WHERE orig_dt >= TO_DATE ('20071016000000',
> 'yyyymmddhh24miss')
> AND orig_dt < TO_DATE ('20071016010000',
> 'yyyymmddhh24miss')
> AND (record_typ='STOP' OR call_duration_value>0)
> AND guid IN (
> SELECT
> guid
> FROM cdrw.call_detail c
> WHERE orig_dt >= TO_DATE ('20071016000000',
> 'yyyymmddhh24miss')
> AND orig_dt < TO_DATE ('20071016010000',
> 'yyyymmddhh24miss')
> AND (record_typ='STOP' OR call_duration_value>0)
> MINUS
> SELECT
> guid
> FROM cdrw.call_detail_cost_vero d
> WHERE orig_dt >= TO_DATE ('20071016000000',
> 'yyyymmddhh24miss')
> AND orig_dt < TO_DATE ('20071016010000',
> 'yyyymmddhh24miss'))
> GROUP BY billing_act_nbr, final_tg_nbr;
>
>
> EXPLAIN PLAN
> QUERY_PLAN
>
> ------------------------------------------------------------------------------------------------------------------------
> SELECT STATEMENT Cost = 32
> 2.1 HASH GROUP BY
> 3.1 FILTER
> 4.1 PX COORDINATOR
> 5.1 PX SEND QC (RANDOM) ":TQ10000"
> 6.1 PX BLOCK ITERATOR
> 7.1 TABLE ACCESS FULL "CALL_DETAIL" TABLE
> 4.2 MINUS
> 5.1 SORT UNIQUE NOSORT
> 6.1 PARTITION RANGE SINGLE
> 7.1 TABLE ACCESS BY LOCAL INDEX ROWID "CALL_DETAIL" TABLE
> QUERY_PLAN
>
> ------------------------------------------------------------------------------------------------------------------------
> 8.1 INDEX RANGE SCAN "CALL_DETAIL_UK" INDEX (UNIQUE)
> 5.2 SORT UNIQUE NOSORT
> 6.1 PARTITION RANGE SINGLE
> 7.1 INDEX RANGE SCAN "CALL_DETAIL_COST_VERO_PK" INDEX (UNIQUE)
>
>
>
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Received on Wed Oct 31 2007 - 10:58:51 CDT