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I have Red Hat Enterprise Linux 6 with Oracle 12c database. I am doing performance benchmarking but there seems to be an OS level cache causing only 1st time read to take significant time.

How can I tell what is being cached and is there a way to clear it?

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I’m on mobile so I cant provide sample output but

$ free -m

Will report cache

You can as root run

sync && echo 3 > /proc/sys/vm/drop_caches

To drop the cache

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