How to discard blocks from memory ?

Hi,
How to discard blocks from memory ?
Thank you.

To add to what has already been posted. The full Oracle version should be included on all posts since many features and most bugs are version dependend.
Oracle will flush dirty blocks from the buffer cache and overlay unchanged blocks as needed to fit new requests to the buffer cache. It also reuses space in the shared pool so the question of which blocks you want to flush from memory and why can be important to getting the most appropriate answer to your questions.
On a production instance it should be unnecessary to manually flush either the buffer cache or shared pool as a normal part of opertations.
HTH -- Mark D Powell --

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