1.检查主库的状态：

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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

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