Applies To: SQL Server 2014, SQL Server 2016 Preview
Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
Used to determine if the current replica is the preferred backup replica.
Applies to: SQL Server (SQL Server 2012 through current version).
Use this function in a backup script to determine if the current database is on the replica that is preferred for backups. You can run a script on every availability replica. Each of these jobs looks at the same data to determine which job should run, so only one of the scheduled jobs actually proceeds to the backup stage. Sample code could be similar to the following.
If sys.fn_hadr_backup_is_preferred_replica( @dbname ) <> 1 BEGIN -- If this is not the preferred replica, exit (probably without error). END -- If this is the preferred replica, continue to do the backup.
A. Using sys.fn_hadr_backup_is_preferred_replica
The following example returns 1 if the current database is the preferred backup replica.
SELECT sys.fn_hadr_backup_is_preferred_replica ('TestDB'); GO