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Thread: How SCN increment?

  1. 10-30-2009, 03:42 AM #1
    pednekar2000
    pednekar2000 is offline Junior Member
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    Angry How SCN increment?

    When ever I see the current scn number, it increases by some amount, even if I am not doing any transaction. What makes SCN increment. Where can I see the cause of SCN increase in any trace file?
    Last edited by pednekar2000; 10-30-2009 at 03:43 AM. Reason: grammer mistake
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  2. 10-30-2009, 04:38 AM #2
    davey23uk
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    the database is always doing something, whether it is your queries or system ones
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  3. 10-30-2009, 09:51 AM #3
    lulon
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    I agree with pednekar2000. Can someone explain how scn's increment? what do you mean by "system ones"?
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  4. 10-30-2009, 10:10 AM #4
    davey23uk
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    agree with what?

    you know the database is doign queries all the time? just becuase you arent doing them doesnt mean the database isnt
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  5. 10-30-2009, 10:41 AM #5
    lulon
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    ok davey, you convinced me. But I'd to know what kind of queries the system does by itself?
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  6. 10-30-2009, 01:03 PM #6
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    PAVB
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    Quote Originally Posted by pednekar2000 View Post
    What makes SCN increment.
    As far as I remember there are two reasons why SCN increments...

    1- Each time a transaction is commited.
    2- Every other second when checkpoint daemon syncs datafiles and controlfile.

    Quote Originally Posted by pednekar2000 View Post
    Where can I see the cause of SCN increase in any trace file?
    I would look at Oracle documentation rather than looking for a trace file.
    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.
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