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Thread: DB_BLOCK_CHECKING

  1. #1
    Join Date
    May 2001
    Location
    New Zealand
    Posts
    123
    Hello

    I have had 2 problems with block corruption caused due to a faulty physical volume . I now want to set the above parameter to TRUE in my init.ora file . I would like to ask about the performance of the DB when DB_BLOCK_CHECKING is TRUE .
    Is the DB's performance reduced greatly by changing the parameter to true . Please suggest .
    Any other implications as well .

    Thanks
    Afshin

  2. #2
    Join Date
    Jun 2001
    Location
    Helsinki. Finland
    Posts
    3,938
    The overhead is from 1-10% according to Oracle. I use this parameter (set to TRUE) in all of mine production DBs. It helps you prevent some corruptions by checking if the data in the blocks is self-consistent.

    I suggest you use.




  3. #3
    Join Date
    Feb 2001
    Location
    Bombay,India
    Posts
    530
    Hi,
    Block checking typically causes 1% to 10% overhead, depending on workload. The more updates or inserts in a workload, the more expensive it is to turn on block checking. You should set DB_BLOCK_CHECKING to true if the performance overhead is acceptable.

    In case of any help please be free to ask me at rohitsn@altavista.com

    Regards,
    Rohit Nirkhe,Oracle DBA,OCp 8i
    rohitsn@altavista.com

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