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 = <filename>
Specifies the path to the flash disk
db_flash_cache_size=<size>
Specifies the amount of flash disk to use

工作原理，我简单的贴个图吧

不错,和SSD有关特性.

内存当内存使-〉内存当硬盘使-〉硬盘当内存使-〉内存当内存使；

N年一轮回，呵呵

新产品总是令人期待

extra price I guess

Good news

替lz补充张图片

Note:

- Customers should test flash drives thoroughly – quality and performance varies greatly
  today
- Large flash areas may require additional SGA for buffer headers, approximately 2 – 4% of
  Flash Cache data
- With large flash drives, the time to “warmup” the cache and deliver full benefit could be
  substantial
- Multiple flash drives may be combined via volume managers or ASM
- Flash drives can use PCI, SCSI, or DIMM connections, as long as they “look” to Oracle like
  a regular disk
- Optional storage clause FLASH_CACHE { KEEP | NONE } to force a table or partition in or out
  of the cache
- Flash cache reduces read I/O, but does not affect write I/O



引用地址 http://blog.sina.com.cn/s/blog_6058d7c10100eupu.html

[ 本帖最后由 nirvanv 于 2009-8-20 23:43 编辑 ]

Oracle不断致力于IO问题的解决，不错！

软件技术随硬件不断发展

终于把ssd搞进来了！