Keep cache option

could anyone explain me if i use keep cache option for the static table, whether it'll have impact to the SGA memory?(I believe the table stored in cache buffer)

According to Oracle document "A good candidate for a segment to put into the KEEP pool is a segment that is smaller than 10% of the size of the DEFAULT buffer pool and has incurred at least 1% of the total I/Os in the system"
so if u load a large table to buffer cache, it will occupy many memory, which could be free for other process. In turn, insufficient buffer cache occurs, the database performance will be worsen.

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