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The KEEP pool is just a buffer cache as DEFAULT and RECYCLE are.
If you do not size KEEP pool to hold all the data you want to keep in there blocks will age out the same way they do when in the DEFAULT or RECYCLE pools - Only difference is, competition for KEEP buffer cache datablocks is restricted to the objects you assign to it.
Hope this clarifies.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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