關於Oracle 11gR2中的Database Smart Flash Cache特性以及該特性所適用的作業系統

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關於Oracle 11gR2中的Database Smart Flash Cache特性以及該特性所適用的作業系統

參考自：

How To Size the Database Smart Flash Cache (文檔 ID 1317950.1)

首先是對Database Smart Flash Cache的介紹：

The Database Smart Flash Cache is a new feature in Oracle Database 11g Release 2 (11.2). The Database Smart Flash Cache is a transparent extension of the database buffer cache using solid state device (SSD) technology. The SSD acts as a Level 2 cache to the (Level 1) SGA.Database Smart Flash Cache can greatly improve the performance of Oracle databases by reducing the amount of disk I/O at a much lower cost than adding an equivalent amount of RAM.

 

Database Smart Flash Cache特性所適用的作業系統：

Your database is running on the Solaris or Oracle Linux operating systems. The flash cache is supported on these operating systems only.

那麼好了,在RHEL設定了Flash Cache後，資料庫執行個體是起不來的，如下：

SQL> startup;ORA-00439: feature not enabled: Server Flash Cache

而Oracle Linux下的資料庫執行個體就能正常啟動

關於Oracle 11gR2中的Database Smart Flash Cache特性以及該特性所適用的作業系統