Creating snapshots & Rollback implications

I intend to launch a script to create a number of snapshots.

The script is in the general format -

CREATE SNAPSHOT SNAP_1 AS SELECT * FROM TABLE_1_at_MASTERDB .........
CREATE SNAPSHOT SNAP_2 AS SELECT * FROM TABLE_2_at_MASTERDB .........
CREATE SNAPSHOT SNAP_3 AS SELECT * FROM TABLE_3_at_MASTERDB .........
CREATE SNAPSHOT SNAP_4 AS SELECT * FROM TABLE_4_at_MASTERDB .........

The question is - what are the implications for COMMITing and THUS Rollback space?

Is there an implicit COMMIT after each snapshot is created?

Thanks in advance for any help.

--
John

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