The “check logical” command in Rman verifies that the objects that you want to back up are consistent. This is important because an inconsistency in the database can cause problems when you try to restore the database.
The “check logical” command compares the datafiles that you want to back up with the datafiles that are currently in use. It also compares the control files and redo logs. If there are any inconsistencies, the “check logical” command will report them.
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