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How to optimize the query to improve the performance

 
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sankar_MF

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Joined: 19 Sep 2006
Posts: 29

PostPosted: Thu Apr 16, 2009 12:40 pm    Post subject: How to optimize the query to improve the performance
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For this condition, there are around 600000 records available in the table.
This query takes more than 1 hour to complete.
Can any please tell me , how to optimize the following query to improve its performance.

Code:
SELECT B.CUST_ID
        , A.ADR_HOME
     FROM PROD.TABLE1 A,
          PROD.TABLE2 B
    WHERE A.ADR_FMT = 'EMAIL'
      AND  A.ZIP5_CDE = ' '
       AND  B.ADDR_TYPE = 'EMAIL'
      AND A.ZIP5_CDE = B.ZIP5_CDE
      AND A.ADR_ID = B.ADR_ID
  WITH UR
  ;



Thanks
Sankar
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dbzTHEdinosauer

Global Moderator


Joined: 20 Oct 2006
Posts: 6970
Location: porcelain throne

PostPosted: Thu Apr 16, 2009 2:51 pm    Post subject: Reply to: How to optimize the query to improve the performan
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Little or nothing exact can be offered without an EXPLAIN.

By the way db2 tables have ROWs not RECORDs.

There are plenty of Threads on Explain, use the search facility.
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ashimer

Active Member


Joined: 13 Feb 2004
Posts: 551
Location: Bangalore

PostPosted: Thu Apr 16, 2009 3:02 pm    Post subject:
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A.ZIP5_CDE is checked for spaces .. and you are using this column to join ??? Post the table indices .... o/p of EXPLAIN ....
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