Chained rows
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Thread: Chained rows

  1. #1
    Join Date
    Jul 2001
    Posts
    108

    Question Chained rows

    Hello Friends,

    By chance do you folks have any scripts to find out the chainded and the migrated rows in the table?

    Also please clarify the difference between Chainded rows Vs. Migrated rows.

    Thanks,
    Nikee

  2. #2
    Join Date
    Jun 2000
    Location
    Madrid, Spain
    Posts
    7,448
    go tahiti.oracle.com and read concepts

    RTFM

  3. #3
    Join Date
    Jul 2001
    Posts
    108
    Pando,

    MYFL.

  4. #4
    Join Date
    Aug 2002
    Location
    Colorado Springs
    Posts
    5,253
    If a row grows too big to fit in it's current block because there are others rows in the block, it gets migrated to a block that has space.

    If the row is too big to fit in any single block, it gets chained across multiple blocks.

    The dba_tables column "chain_cnt" is the sum of both of these I believe.
    David Aldridge,
    "The Oracle Sponge"

    Senior Manager, Business Intelligence Development
    XM Satellite Radio
    Washington, DC

    Oracle ACE

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