--目前主庫PROD3,備庫AUX
--檢視主備庫日誌傳輸情況
[email protected]> select max(sequence#) from v$archived_log;

MAX(SEQUENCE#)
--------------
	    34
		
[email protected]> select sequence#,applied from v$archived_log order by 1 desc;

 SEQUENCE# APPLIED
---------- ---------
	34 YES
	34 YES
	34 YES
	33 YES
	32 YES
	31 YES
	30 YES		
	
--檢視主備庫狀態	
 
[email protected]> select name,database_role,switchover_status from v$database;

NAME	  DATABASE_ROLE    SWITCHOVER_STATUS
--------- ---------------- --------------------
PROD3	  PRIMARY	   TO STANDBY

[email protected]> select name,database_role,switchover_status from v$database;

NAME	  DATABASE_ROLE    SWITCHOVER_STATUS
--------- ---------------- --------------------
PROD3	  PHYSICAL STANDBY NOT ALLOWED

--先主庫切換到備庫
 
[email protected]> alter database commit to switchover to physical standby with session shutdown;

Database altered.
--同時備庫trace檔案中節選
RFS[2]: Possible network disconnect with primary database


[email protected]> select name,database_role,switchover_status from v$database;

NAME	  DATABASE_ROLE    SWITCHOVER_STATUS
--------- ---------------- --------------------
PROD3	  PHYSICAL STANDBY TO PRIMARY

--備庫切換到主庫
 
[email protected]> alter database commit to switchover to primary;

Database altered.

[email protected]> alter database open;

Database altered.

--啟動備庫進行恢復
[email protected]> startup
ORACLE instance started.

Total System Global Area  958341120 bytes
Fixed Size		    1348972 bytes
Variable Size		  281021076 bytes
Database Buffers	  671088640 bytes
Redo Buffers		    4882432 bytes
Database mounted.
Database opened.

[email protected]> select open_mode from v$database; 

OPEN_MODE
--------------------
READ ONLY

[email protected]> select name,database_role,switchover_status from v$database;

NAME	  DATABASE_ROLE    SWITCHOVER_STATUS
--------- ---------------- --------------------
PROD3	  PHYSICAL STANDBY RECOVERY NEEDED

[email protected]> alter database recover managed standby database disconnect from session;  

Database altered.

[email protected]> select name,database_role,switchover_status from v$database;

NAME	  DATABASE_ROLE    SWITCHOVER_STATUS
--------- ---------------- --------------------
PROD3	  PHYSICAL STANDBY NOT ALLOWED

[email protected]> select open_mode from v$database; 

OPEN_MODE
--------------------
READ ONLY WITH APPLY

--檢視主庫狀態
[email protected]> select open_mode from v$database; 

OPEN_MODE
--------------------
READ WRITE

SQL> select name,database_role,switchover_status from v$database;

NAME	  DATABASE_ROLE    SWITCHOVER_STATUS
--------- ---------------- --------------------
PROD3	  PRIMARY	   TO STANDBY