[ORACLE DATAGUARD] switchover的过程

1.检查主库的状态：

SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;

SWITCHOVER_STATUS

--------------------

TO STANDBY

2.将主库设置为standby role

alter database commit to switchover to physical standby;

shutdown immediate;

startup mount;

3.将standby转为primary

SQL> select NAME ,DB_UNIQUE_NAME ,open_mode,DATABASE_ROLE from v$database;

NAME DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE

--------- ------------------------------ -------------------- ----------------

ORCL sty MOUNTED PHYSICAL STANDBY

SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;

SWITCHOVER_STATUS

--------------------

TO PRIMARY

alter database commit to switchover to primary;

alter database open;

SQL> select NAME ,DB_UNIQUE_NAME ,open_mode,DATABASE_ROLE from v$database;

NAME DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE

--------- ------------------------------ -------------------- ----------------

ORCL sty READ WRITE PRIMARY

4.原来的primary库上执行：

alter database recover managed standby database disconnect from session;

SQL> select NAME ,DB_UNIQUE_NAME ,open_mode,DATABASE_ROLE from v$database;

NAME DB_UNIQUE_NAME OPEN_MODE DATABASE_ROLE

--------- ------------------------------ -------------------- ----------------

ORCL pri MOUNTED PHYSICAL STANDBY