Fenng(dbanotes) posted a photo:
refer: www.itpub.net/archiver/tid-1202299.html
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)
Faster than disk (100x faster for reads)
Cheaper than memory ($50 per gigabyte)
Large capacity (hundreds of gigabytes per flash disk)
Fewer drives and better performance
For I/O throughput, users often use hundreds of drives today
Flash enables I/O throughput without all the drives
Large jobs complete faster
Install Flash Drive in the Host Server
Set two init.ora parameters:
db_flash_cache_file =
Specifies the path to the flash disk
db_flash_cache_size=
Specifies the amount of flash disk to use