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  • what actually want to do that? want to take backup of your database through RMAN or want to see the backup file through RMAN. Commented Aug 9, 2017 at 9:26
  • i want to backup full database.but there is something wrong with the datafile 5 and 7. the datafile 5 and 7 is useless and i want to alter them, Commented Aug 9, 2017 at 9:32
  • I am not able to see your 'Alter Command' could you please edit in your question. what you are trying to run ALTER command in SQL or RMAN command prompt. Commented Aug 9, 2017 at 9:35
  • @MdHaidarAliKhan Um...could you tell me how to solve the problem about"RMAN-06169: could not read file header for datafile 5 error reason 4" Commented Aug 9, 2017 at 9:36
  • @MdHaidarAliKhan I mean"alter database datafile 5 offline drop;"← Commented Aug 9, 2017 at 9:41