Oracle 10g dataguard

Question

Hi all
I have created a dataguard on a separate server and shifted the production database to dataguard server in an emergency. Now I want to revert back to the production server.
Please tell me the procefure for the same and tell me that how much data loss will occure?

Answer 1

try this solution
On the current primary database, query the SWITCHOVER_STATUS column of the V$DATABASE fixed view
on the primary database to verify it is possible to perform a switchover. For example: 
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
TO STANDBY
OR  
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
SESSIONS ACTIVE
Initiate the switchover on the primary database 
To change the current primary database to a physical standby database role, use the following SQL statement
on the primary database: 
If the value in the SWITCHOVER_STATUS column is TO STANDBY 
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY; 
If the value in the SWITCHOVER_STATUS column is SESSIONS ACTIVE 
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PHYSICAL STANDBY WITH SESSION SHUTDOWN;
Shut down the former primary instance, and restart and mount the database and confirm the switch over notification: 
SQL> SHUTDOWN IMMEDIATE;
SQL> STARTUP MOUNT;
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
TO_PRIMARY
Switch the target physical standby database role to the primary role. 
If switch over status is to primary:  
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
If switch over status is active session:
SQL> ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY WITH SESSION SHUTDOWN; 
Finish the transition of the standby database to the primary role 
If standby database has not been opened in read-only mode since the last tiem it was started, issue
SQL> alter database open; 
If the physical standby database has been opened in read-only mode since the last time it was stared, you must
issue
SQL>shutdown immediate;
SQL>startup;
 Enable the log_archive_dest_state_n parameter for redo transmission 
At new Standby database activate media recovery: 
SQL> Alter database recover managed standby database disconnect from session; 
regards,