oracle11gdataguard如何切换
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1.查看主库是否满足切换条件
SQL> select switchover_status from v$database; SWITCHOVER_STATUS ---------------------------------------- TO STANDBY
有时候会显示 SESSION ACTIVE,这表示当前还有活动的会话连接。
2.执行下面的命令切换
SQL> alter database commit to switchover to physical standby; Database altered.
如果第一步切换条件查看显示 SESSION ACTIVE,那么在这里使用下面命令
SQL> alter database commit to switchover to physical standby WITH SESSION SHUTDOWN;
3.关闭数据库重启到 mount
SQL> shutdown immediate; ORA-01012: not logged on SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options [oracle@oraclerac2 ~]$ sqlplus "/ as sysdba" SQL*Plus: Release 11.2.0.4.0 Production on Wed Aug 1 17:45:33 2018 Copyright (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 bytes Fixed Size 2262656 bytes Variable Size 2885683584 bytes Database Buffers 1.8455E+10 bytes Redo Buffers 36073472 bytes Database 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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