analyze compute stats
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Thread: analyze compute stats

  1. #1
    Join Date
    Feb 2007
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    212

    analyze compute stats

    Hi Friends,

    I forgot the syntax on how to analyze and compute stats on all tables/indexes
    in one's schema. Can u help pls ....thanks

  2. #2
    Join Date
    Sep 2002
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    look up dbms_stats

  3. #3
    Join Date
    Jan 2007
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    231
    there is no syntax to forget..

    you can use dbms_utility package..

    Eg.,

    EXEC DBMS_UTILITY.analyze_schema('SCOTT','COMPUTE');
    EXEC DBMS_UTILITY.analyze_schema('SCOTT','ESTIMATE', estimate_rows => 100);
    EXEC DBMS_UTILITY.analyze_schema('SCOTT','ESTIMATE', estimate_percent => 15);

  4. #4
    Join Date
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    Quote Originally Posted by jennifer2007
    I forgot the syntax on how to analyze and compute stats on all tables/indexes
    You forgot to mention you also forgot the syntax on how to google or metalink it
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

  5. #5
    Join Date
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    Quote Originally Posted by ams-jamali
    there is no syntax to forget..

    you can use dbms_utility package..

    Eg.,

    EXEC DBMS_UTILITY.analyze_schema('SCOTT','COMPUTE');
    EXEC DBMS_UTILITY.analyze_schema('SCOTT','ESTIMATE', estimate_rows => 100);
    EXEC DBMS_UTILITY.analyze_schema('SCOTT','ESTIMATE', estimate_percent => 15);
    ugh no way should you use dbms_utility, not at all

  6. #6
    Join Date
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    Quote Originally Posted by ams-jamali
    EXEC DBMS_UTILITY.analyze_schema('SCOTT','COMPUTE');
    Ugh, dbms_utility.

    I feel more secure in my job today.
    Jeff Hunter
    marist89@yahoo.com
    http://marist89.blogspot.com/
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  7. #7
    Join Date
    Jan 2007
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    231
    Dave..,

    can you please explain(if it is not secure) why i should not use dbms.utility package to find entire schema stats.
    (by god's graze till now i have used only on testDB but not in prod)
    Last edited by ams-jamali; 05-31-2007 at 08:21 AM. Reason: increase details

  8. #8
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    DBMS_UTILITY.ANALYZE_SCHEMA got desupported in Ora9i
    The only supported way to generate stats in Ora9i and upper is DBMS_STATS
    Pablo (Paul) Berzukov

    Author of Understanding Database Administration available at amazon and other bookstores.

    Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

  9. #9
    Join Date
    Jan 2007
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    only now i came to know it is desupported.

    Thanks PavB

  10. #10
    Join Date
    Mar 2004
    Location
    DC,USA
    Posts
    650
    To add more points for clarity:

    DBMS_STATS was available from 8i onwards apart from ANALYZE/DBMS_UTILITY. Oracle recommended to use DBMS_STATS as this collects statistics globally and more accurate and also the ability to parallelise statistics collection. These are not possible in ANALYZE and it collects statistics at the lowest level.

    Optimizer uses global statistics to gather access path.

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