Venzi's Tech-Blog

14 April 2011

Log file sync to death…

Filed under: Oracle,Performance — Venzi @ 13:53

What happens if you forget to move our redo logs to a fast disk? Well you will see something like this:

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3 Comments »

  1. And what solution did you choose? Just faster disks? Or SSDs?

    Comment by ak — 19 April 2011 @ 11:49 | Reply

  2. I’ve seen such a behaviour when in the same storage system FATA and FC drives were present. When the FATA is heavily loaded I’ve started seeing slow log file syncs and respectively graphics like above.

    Regards,
    Sve

    Comment by Svetoslav Gyurov — 20 April 2011 @ 09:28 | Reply

  3. I forgot to setup the log files. They were on the same disc as the datafiles and the default 50MB. This graph above shows you that you do nearly nothing else anymore as waiting for the log files.
    So what I did was to make the 1GB big + moved them on raw devices and all was fine again.

    Comment by Venzi — 21 April 2011 @ 00:18 | Reply


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