oracle11g dataguard如何切换

这篇文章主要介绍"oracle11g dataguard如何切换"，在日常操作中，相信很多人在oracle11g dataguard如何切换问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"oracle11g dataguard如何切换"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

1.查看主库是否满足切换条件

SQL> select switchover_status from v$database;SWITCHOVER_STATUS----------------------------------------TO STANDBY

有时候会显示 SESSION ACTIVE，这表示当前还有活动的会话连接。

2.执行下面的命令切换

SQL> alter database commit to switchover to physical standby;Database altered.

如果第一步切换条件查看显示 SESSION ACTIVE，那么在这里使用下面命令

SQL> alter database commit to switchover to physical standby WITH SESSION SHUTDOWN;

3.关闭数据库重启到 mount

SQL> shutdown immediate;ORA-01012: not logged onSQL> exitDisconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing options[oracle@oraclerac2 ~]$ sqlplus "/ as sysdba"SQL*Plus: Release 11.2.0.4.0 Production on Wed Aug 1 17:45:33 2018Copyright (c) 1982, 2013, Oracle.  All rights reserved.Connected to an idle instance.SQL> startup mount;ORACLE instance started.Total System Global Area 2.1379E+10 bytesFixed Size    2262656 bytesVariable Size 2885683584 bytesDatabase Buffers 1.8455E+10 bytesRedo Buffers   36073472 bytesDatabase mounted.

4.用 Read Only 模式打开

SQL> alter database open read only;Database altered.

5.启动 Redo 应用模式

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT FROM SESSION;Database altered.

6.切换后查看角色

SQL> select database_role,switchover_status from v$database;DATABASE_ROLE SWITCHOVER_STATUS-------------------------------- ----------------------------------------PHYSICAL STANDBY TO PRIMARY

7.以上操作都是原来的主库完成的，下面的操作在原来的备库完成

8.查看 Standby Database 是否满足切换条件

SQL> select database_role,switchover_status from v$database;DATABASE_ROLE SWITCHOVER_STATUS-------------------------------- ----------------------------------------PHYSICAL STANDBY TO PRIMARY

9.执行下面命令进行切换

SQL> alter database commit to switchover to primary;Database altered.

10.打开数据库

SQL> alter database open;Database altered.

11.切换后查看角色

SQL> select database_role,switchover_status from v$database;DATABASE_ROLE SWITCHOVER_STATUS-------------------------------- ----------------------------------------PRIMARY  TO STANDBY

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