Error Code RMAN-06026: error reading backup piece

restoring datafile 00171 to H:\SYSTEM04.DBF
channel ORA_DISK_1: reading from backup piece K:BACKUPE1J96QQG_1_1.BAK
ORA-19870: error reading backup piece K:BACKUPE1J96QQG_1_1.BAK
ORA-19612: datafile 70 not restored due to missing or corrupt data
failover to previous backup



RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 03/04/2008 18:48:23
RMAN-06026: some targets not found - aborting restore


Details:

The above error occurred as a result of trying to restore a database using

RMAN> restore database;

A validate of the backup set showed that the backup set was corrupt

RMAN> validate backupset 3669

channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece K:BACKUPE1J96QQG_1_1.BAK
channel ORA_DISK_1: restored backup piece 1
piece handle=K:BACKUPE1J96QQG_1_1.BAK tag=TAG20080220T151208
channel ORA_DISK_1: validation complete, elapsed time: 00:07:06
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 03/04/2008 19:58:14
ORA-19660: some files in the backup set could not be verified
ORA-19661: datafile 70 could not be verified

Solution:

The RMAN backup set is corrupt and you be unable to use the backup set.

To resolve the issue , take another RMAN backup and validate all backup sets.

To get a list of all backup sets

RMAN > list backupsets;

RMAN > validate backupset ;