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Oracle 11g Snapshot Standby Database

Oracle 11g New Features Tips by Donald BurlesonJune 29, 2015

Oracle 11g New Features Tips

Snapshot Standby is an 11g new feature that has some interesting applications.  One beneficial way to apply this technology would be if the DBA needs to perform testing, even potentially destructive testing.  Rather than ordering another server to perform this testing, the DBA could utilize Snapshot Standby.  The DBA would perform the test on the standby.  Then rewind in time to back out changes and then sync to get the standby current again.  Oracle promises with 11g to deliver higher quality service at lower cost.  How is that for cost savings!

This is different than Flashback Database which was added in 10g to provide Data Guard a method to correct user errors. Flashback Database can be used on both the production and standby database to easily revert the databases to a point in time before the user made the error.

The following steps will switch a standby database to snapshot mode:

alter database convert to snapshot standby;

Logs are still sent to standby but they are not applied.  The DBA can now make changes and perform testing on the standby database. 

% Keep in mind that there will be zero data loss due to the logs still being received        BUT since they are not being applied users will not have Real Time Query while in        Snapshot Standby mode.

Once the testing is completed the DBA can revert the database back to a physical standby database to catch-up to production:

alter database convert to snapshot standby;

It has now come full circle as it's a standby database again with all changes backed out and the redo is applied from the main database.

Creation of Standby Database

As mentioned in Chapter 4, Enterprise Manager is now able to create a standby database from existing RMAN backups.  To access the Clone Database interface click the Data Movement tab, then click Clone Database.  Figure 9.1 illustrates this improved interface for database cloning.  Here the DBA can create a standby database from an existing RMAN backup. 

RMAN can create a standby database by copying the files currently in use by the primary database without needing a backup.  RMAN uses the DUPLICATE command to create the standby database. 

Figure 9.2

Figure 9.3 below shows the executions steps taken by OEM to create the standby database.

Figure 9.3


This is an excerpt from the new book Oracle 11g New Features: Expert Guide to the Important New Features by John Garmany, Steve Karam, Lutz Hartmann, V. J. Jain, Brian Carr.

You can buy it direct from the publisher for 30% off.


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