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Thread: log switches occuring too quickly

  1. #1
    Join Date
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    log switches occuring too quickly

    Oracle 8 on Solaris
    I have a situation where log switches are occuring too quickly (within seconds) at one site. log_checkpoint_interval is set to 0 and its not occuring in other sites with similar configuration.
    Any pointers on which direction to proceed?? What should I check further?

    Raminder Singh

    Oracle Certified DBA: Oracle 8i, 9i


    Mail me at raminderahluwalia@rediffmail.com.

  2. #2
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    chennai,bangalore
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    Hi Raminder,
    Is your site experiencing heavy transaction which might be writing too fast into the redo log and switching.And also what is the size of your redo log files.

    Regards
    anandkl
    anandkl

  3. #3
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    How big are they?
    Do you have archivelogs - how big are they?
    Tomaž
    "A common mistake that people make when trying to design something completely
    foolproof is to underestimate the ingenuity of complete fools" - Douglas Adams

  4. #4
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    The size of the redologs is about 10 M each (there are three) and its in Archivelog mode.
    Anand, how to find whether the site is featuring 'heavy' transactions and the size of transactions? I am not getting the correct dynamic view right now.

    Raminder Singh

    Oracle Certified DBA: Oracle 8i, 9i


    Mail me at raminderahluwalia@rediffmail.com.

  5. #5
    Join Date
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    ATLANTA, GA, USA
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    Use the following query to know just how many transactions are taking place in your system.

    select to_char(sysdate,'dd-mon-yyyy hh24:mi:ss') ttime,
    name,
    value
    from v$sysstat
    where name like '%user commit%' ;

  6. #6
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    Thanks Tamil
    The problem seems to be solving on its own. Maybe it was a temporary phase when transaction volumes/sizes increased tremendously.
    Thanks everyone for help.

    Raminder Singh

    Oracle Certified DBA: Oracle 8i, 9i


    Mail me at raminderahluwalia@rediffmail.com.

  7. #7
    Join Date
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    greenwich.ct.us
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    Check your alert.log to see if you have any "Checkpoint not complete" messages. If not, don't worry about it. If you do have these messages, you probably need more redo for the next time you experience a heavy load.
    Jeff Hunter

  8. #8
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    None of those messages right now. I will keep a track, though. Thanks Jeff.

    Raminder Singh

    Oracle Certified DBA: Oracle 8i, 9i


    Mail me at raminderahluwalia@rediffmail.com.

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