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Now if a user wants to read more than one revision, he can specify a snapshot and the maximum number of revisions he wishes to read.

Example:
mysnapshot = (C1,5), (C2,5),(C3,5)
User specification : Read table "Cars" using mysnapshot, maximum number of revisions = 3.
Output : (Z,Z,P), (Q,R,Y), (P,Z,R).

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When a job (or user) requests the revision manager to take a latest snapshot, the list of currently running transactions is consulted. The lowest revision number minus 1 , among the list is used in the snapshot.

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