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Thread: Direct Io and async Io

  1. #11
    Join Date
    Jan 2001
    Posts
    2,828
    Hi Folks

    For seeing that direct_io is enabled is this the only method
    trace the dbwr session and then see that dbwr opens the file in

    DIRECTIO in the open system call.
    open("/tmp/test.dbf", O_RDWR|O_SYNC|O_DIRECT|O_LARGEFILE) = 21

    I am on redhat Linux Advanced server 3.0

    regards
    Hrishy

  2. #12
    Join Date
    Mar 2002
    Location
    Mesa, Arizona
    Posts
    1,204
    I may be in left field here, but according to this article oracle doesn't take advantage of direct i/o on linux...

    It says direct i/o is "available (2.4 kernels), not yet used by Oracle"

    Ken

  3. #13
    Join Date
    Sep 2001
    Location
    Makati, Philippines
    Posts
    857
    Originally posted by KenEwald
    I may be in left field here, but according to this article oracle doesn't take advantage of direct i/o on linux...

    It says direct i/o is "available (2.4 kernels), not yet used by Oracle"

    Ken
    This article was published 2002. So this could no longer probably be true. I'll check if I have time the kernel versions of linux o.s. later.

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