Description of the illustration testmaster-dataguard.png

The image is a diagram that shows, from left to right, a Production Database (Primary), a Test Master Physical Standby Database, four RW Snapshots, and four Test Instance Snap databases (DB1, DB2, DB3, and DB4). The top of the image has two arrows. The first arrow, labeled Clone, leads from the Production Database to the Test Master Database. The second arrow, labeled Snap, leads from the Test Master Database to the Test Instance Snap databases. Oracle Data Guard uses the primary database to create a physical standby Test Master. Read Write (RW) snaps are created from the Test Master. Each RW snap is associated with a different Test Instance Snap (DB1, DB2, DB3, and DB4).