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I have oracle database on a Solaris 9 box.

Oracle datafiles are stored on the ufs filesystem mounted with forcedirectio. So I'm using now only Oracle Buffer Cache.

question: is it good idea to remove forcedirectio option to improve IO performance?

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migrated from stackoverflow.com Oct 19 '10 at 20:21

This question came from our site for professional and enthusiast programmers.

No, forcedirectio causes the Solaris disk buffers to be bypassed thus avoiding double buffering and speeding things up.

Removing forcedirectio will most likely have a negative effect on IO Performance.

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