The illustration shows a primary database (Prim) connected to a disaster recovery site (DR), Prim is also connected to the test master (TM) using Data Guard. TM has all sparse files, and the parents are TM Friday.

There are multiple other test masters, located between DR and TM. These are called TM original (which uses the original full data files R/O), TM Monday (sparse files R/W), TM Tuesday (sparse files R/W), an ellipsis indicating additional TMs, and TM Friday (sparse files R/W).

The snapshots Joe Snap and Mary Snap point to TM original.

The snapshot Irene Snap points to the snapshot Joe Snap2, which points to TM Monday.

The snapshot Joe Snap3 points to TM Tuesday.

The snapshots Fred Snap and Irene Snap2 point to TM Friday