Thursday Feb 14, 2008

Ensuring directIO with Oracle 10.2.0.3 on Solaris UFS filesystems

I usually really dislike blog entries that have nothing to say other than repackage bug descriptions and offer them up as knowledge, but in this case I have made an exception since the full impact of the bug is not fully described.

There is a fairly nasty Oracle bug with 10.2.0.3 that prevents the use of DirectIO with Solaris. The metalink note "406472.1" describes the failure modes but fails to mention the performance impact if you use "filesystemio_options=setall" and fail to have the mandatory patch "5752399" in place.

This was particularly troubling to me since we have been recommending for years the use of the "setall" to ensure all the proper filesystem options are set for optimal performance. I just finished working a customer situation where this patch was not installed and their critical batch run-times were nearly 4x as large... Not a pretty situation.... OK, So bottom line:
    MAKE SURE YOU INSTALL "5752399" WHEN USING ORACLE 10.2.0.3 !!!
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This blog discusses performance topics as running on Sun servers. The main focus is in database performance and architecture but other topics can and will creep in.

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