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Thread: cputime & elapsedtime where to see first when there is huge difference

  1. #1
    Join Date
    Apr 2003
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    cputime & elapsedtime where to see first when there is huge difference

    1.What are the main places to look when
    there is a huge difference between
    elapsed_time and cpu_time of v$sql. (elapsed_time>cpu_time).

    2. Some cases we found cpu_time is greater than elapsed_time..What could be the reason for this.(elapsed_time

  2. #2
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    1. Disk I/O usually makes the difference.

    2. Multi-CPUs: 4 CPUS can give you 4 seconds CPU per second elapsed.

  3. #3
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    Originally posted by DaPi
    1. Disk I/O usually makes the difference.

    2. Multi-CPUs: 4 CPUS can give you 4 seconds CPU per second elapsed.
    Part 2 is exact .. 4 cpus are there.

    But point 1 ..I am still searching the exact reasons.
    ..

  4. #4
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    Wait time due to I/O that is not part of CPU.
    -nagarjuna

  5. #5
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    Apr 2003
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    The query is not much i/o intensive..

  6. #6
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    wat about LIO?
    funky...

    "I Dont Want To Follow A Path, I would Rather Go Where There Is No Path And Leave A Trail."

    "Ego is the worst thing many have, try to overcome it & you will be the best, if not good, person on this earth"

  7. #7
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    alter session set events '10046 trace name context forever, level 12'


    and check the tkprof output of the tracefile. You will see the events for which the session is/was waiting.
    -nagarjuna

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