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Nth level backup contains change since the last (N-1)th (however differential and incremental backups were introduced after 9i).
Features change with versions, level 4 is the maximum now.
RMAN-06011: invalid level specified: number
Cause: An invalid incremental backup level was specified.
Action: Incremental backup level must be between 0 and 4.
Thanks Balazs for replying.
Well error code is very much direct and says about invalid level specified: That is 5 and can be easily collected from OERR Utility or by referring any xyz webpage or Metalink.
There were more than Level 4 in older release. 0-4 are still available in Oracle 11g R2.
But my query stands still.
Question: what is the significance of using Level 3 - Level 4 ? ... If possible please provide any examples.