Oracle Flash Cache
                                                 Last update (2012-07-01 13:55:24)
                                                                                                                   Date added (2010-09-17 20:46:35)

Summary
So what is Oracle Flash Cache or Database Flash Cache?
In simple words is a transparent extension of the database buffer cache using solid-state disk (SSD) technology. SSD acts as a Level 2 cache (SGA is Level 1).

Why to use it?
Because is faster than disk (10x faster for reads) and
Cheaper than memory and
it has Large capacity (hundreds of gigabytes per flash disk) and
Fewer drives with better performance
For I/O throughput, users often use hundreds of drives today
Flash enables I/O throughput without all the drives

The Database Flash Cache, has nothing to do with Exadata Smart Flash Cache.
The images below shows how the database flash cache "Extends the Buffer Cache"



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