best performance quries
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Thread: best performance quries

  1. #1
    Join Date
    Feb 2009
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    best performance quries

    hi to all
    i have table with 25M AND 80 column on oracle g11

    i have query on first name varchar(128) and i create bitmap index its take 0.1 - 0.9 sec , the query is seek
    but i need to make it more faster .

    some one can tell me how to handle with that or suggest me ways ?

    ofer

  2. #2
    Join Date
    Sep 2002
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    you find your wait events and tune them -but if you think you are going to get better performance frm 0.1 to 0.9 seconds - you are probably in la la land

  3. #3
    Join Date
    Feb 2009
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    hi

    it can be happened.

    do u have any experience on huge data base?

  4. #4
    Join Date
    Mar 2007
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    Ft. Lauderdale, FL
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    bitmap index? Why?

    Is that a FACT table in a Data Warehouse?
    Is somehow your query taking advantage of star-transformation?
    Are there other bitmap indexed columns included in your predicate?
    What is the cardinality of your first_name bitmap index?
    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
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    Quote Originally Posted by oferoh View Post
    it can be happened.

    do u have any experience on huge data base?
    25m rows is hardly a database.
    Jeff Hunter
    marist89@yahoo.com
    http://marist89.blogspot.com/
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