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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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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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