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Thread: Hash_value

  1. 06-09-2004, 05:39 AM #1
    seelan
    seelan is offline Member
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    Hash_value

    Hi,

    I know how to find the hash_value for the corresponding sql_text

    Can anyone define what is hash_value. I already referred documentation and serched this forum also. But I could not find out.

    Please explain

    Seelan
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  2. 06-09-2004, 09:38 AM #2
    rotem_fo
    rotem_fo is offline Hangin Around,,,
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    HASH_VALUE - The Hash Value of the statement in the library cache.
    When a SQL Statement is issues against the DB, the statement is passed through a hash procedure. Oracle uses this hash value to search the shared_pool for the already parsed statement.
    It is better to ask and appear ignorant, than to remain silent and remain ignorant.

    Oracle OCP DBA 9i,
    C++, Java developer
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  3. 06-09-2004, 05:40 PM #3
    Axr2
    Axr2 is offline Senior Advisor
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    2 completely different queries can hash to the same value. You'd be better off using address for finding the correct sql_text; better still a combination of address and hash_value.
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