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Oracle DB Smart Flash Cache - How it works

Oracle’s Database Smart Flash Cache functions as a victim cache, which means that it stores clean (unmodified) database blocks that have been evicted from the SGA buffer cache to make room for other blocks. If a block selected for eviction has been modified, the dirty block is first written to disk by one of the database writer (DBWR) processes, then it is written to the Database Smart Flash Cache.

Blocks can later be retrieved from the Database Smart Flash Cache and returned to the SGA as required. If a block cannot be found either in the SGA buffer cache or the Database Smart Flash Cache, it will be retrieved from disk.
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