With a mysql instance and multiple databases within that instance is there a way to allocate which database you would like to assign priority to the buffer pool size?

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You can configure MyISAM dedicated key buffers. No such buffer scheme exists with InnoDB.

Usually, it is recommended to assign up to 80% of server RAM to the InnoDB Buffer Pool.

Since you cannot prioritize which database or tables can occupy the InnoDB Buffer Pool, all you can really do is create a buffer large enough to hold all InnoDB data.

See my earlier posts on sizing the InnoDB Buffer Pool

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