Remove backuppiece from the RMAN repository

1.If the backuppiece is deleted manually in the Operating system, any reference to the backuppiece will be removed using the change.. uncatalog clause

RMAN> change backuppiece "+DATA/cvrman/backupset/2014_05_16/nnndf0_tag20140516t064900_0.321.847694943" uncatalog;

uncataloged backup piece
backup piece handle=+DATA/cvrman/backupset/2014_05_16/nnndf0_tag20140516t064900_0.321.847694943 RECID=156 STAMP=847694942
Uncataloged 1 objects