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Thread: Recursive SQl and LMT

  1. #1
    Join Date
    Apr 2001
    Location
    London
    Posts
    725
    Oracle 8i

    Hi Friends,

    I have a database running an application with poorly tuned sql statements which the vendor refuses to overhaul.

    The poor sql results in thousands of buffer gets per execution. I have also noticed a lot of recursive sql.

    If I were to convert my tablespaces to LMT, would this significantly reduce recursive sql to a point where a performance gain would be noticed ?

    Thanks

    Suresh









    Once you have eliminated all of the impossible,
    whatever remains however improbable,
    must be true.

  2. #2
    Join Date
    Dec 2000
    Location
    Ljubljana, Slovenia
    Posts
    4,439
    I don't think you will notice very high reduction of recursive SQL just by switching to LMT. You will only eliminate the recursive SQLs that deal with extent (a)location. So unless your application allocates lot of new extents during its work, there will not be much difference.
    Jurij Modic
    ASCII a stupid question, get a stupid ANSI
    24 hours in a day .... 24 beer in a case .... coincidence?

  3. #3
    Join Date
    Jun 2000
    Location
    Madrid, Spain
    Posts
    7,447
    I think a good way to overcome badly SQL from application vendors is using stored outlines, forcing good executiion plans for those evil SQL stmts!

  4. #4
    Join Date
    Apr 2001
    Location
    London
    Posts
    725
    Thanks Folks..
    Once you have eliminated all of the impossible,
    whatever remains however improbable,
    must be true.

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