How a Database Is Mounted with Real Application Clusters (294)

tsinglee發表於2007-12-02
DatabaseAPP
If Oracle allows multiple instances to mount the same database concurrently, then the
database administrator can use the CLUSTER_DATABASE initialization parameter to
make the database available to multiple instances. The default value of the CLUSTER_
DATABASE parameter is false. Versions of Oracle that do not support Real
Application Clusters only allow CLUSTER_DATABASE to be false.
If CLUSTER_DATABASE is false for the first instance that mounts a database, then
only that instance can mount the database. If CLUSTER_DATABASE is set to true on
the first instance, then other instances can mount the database if their CLUSTER_
DATABASE parameters are set to true. The number of instances that can mount the
database is subject to a predetermined maximum, which you can specify when
creating the database.
RAC系統中的資料庫如何載入
1. 某些版本的 Oracle 允許多個例項同時裝載同一個資料庫,DBA 需要使用 CLUSTER_DATABASE
初始化引數來開啟(設定為True , 某些版本只能為False)此項功能
2. 當第一個掛載資料庫的例項的 CLUSTER_DATABASE 引數為 true 時,其它 CLUSTER_DATABASE
引數為 true 的例項也可以掛載同一個資料庫
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