What are RMAN "RESTORE .. PREVIEW" and "BACKUP .. VALIDATE" pros.&cons.?

On 10gR2 and Solaris 10 we want to test our rman backups periodically. Can I have your advices on which method and how we might use?
BACKUP .. VALIDATE
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/strategy004.htm#sthref186
RESTORE... PREVIEW
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14192/recov003.htm#sthref555
Thank you.

As they are for different purposes both can be used. You can get detailed information using PREVIEW like which files the backup set contains, which archivelogs will be used, etc...
RMAN> restore database preview;
Starting restore at 04.JAN.2008 15:56:41
allocated channel: ORA_SBT_TAPE_1
channel ORA_SBT_TAPE_1: sid=135 devtype=SBT_TAPE
channel ORA_SBT_TAPE_1: WARNING: Oracle Test Disk API
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=143 devtype=DISK
List of Backup Sets
===================
BS Key Type LV Size       Device Type Elapsed Time Completion Time
42      Full    861.50M    SBT_TAPE    00:02:51     25.DEC.2007 15:24:16
        BP Key: 39   Status: AVAILABLE Compressed: NO Tag: TAG20071225T152124
        Handle: 1ij4gdbl_1_1   Media: /sbt_tape,1ij4gdbl_1_1
List of Datafiles in backup set 42
File LV Type Ckp SCN    Ckp Time             Name
1       Full 2676243    25.DEC.2007 15:21:02 /disk1/oradata/10G/datafile/o1_mf_system_3lyw58ct_.dbf
2       Full 2676243    25.DEC.2007 15:21:02 /disk1/oradata/10G/datafile/o1_mf_undotbs1_3lj593qr_.dbf
3       Full 2676243    25.DEC.2007 15:21:02 /disk1/oradata/10G/datafile/o1_mf_sysaux_3lj598gc_.dbf
4       Full 2676243    25.DEC.2007 15:21:02 /disk1/oradata/10G/datafile/o1_mf_data_3lj7f81h_.dbf.tmp
using channel ORA_SBT_TAPE_1
using channel ORA_DISK_1
List of Archived Log Copies
Key     Thrd Seq     S Low Time             Name
103     1    106     A 26.DEC.2007 09:15:19 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_26/o1_mf_1_106_3q4h8sqg_.arc
104     1    107     A 26.DEC.2007 13:38:01 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_26/o1_mf_1_107_3q5dxp9w_.arc
105     1    108     A 26.DEC.2007 22:04:05 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_27/o1_mf_1_108_3q7hkpyw_.arc
106     1    109     A 27.DEC.2007 17:01:09 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_27/o1_mf_1_109_3q7jcvq3_.arc
107     1    110     A 27.DEC.2007 17:15:07 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_27/o1_mf_1_110_3q7jl37r_.arc
108     1    111     A 27.DEC.2007 17:18:27 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_27/o1_mf_1_111_3q7jo6hk_.arc
109     1    112     A 27.DEC.2007 17:20:06 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_28/o1_mf_1_112_3q883z06_.arc
110     1    113     A 28.DEC.2007 00:00:30 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_28/o1_mf_1_113_3qbol2q6_.arc
111     1    114     A 28.DEC.2007 22:02:09 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_29/o1_mf_1_114_3qcknl4s_.arc
112     1    115     A 29.DEC.2007 06:01:20 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_29/o1_mf_1_115_3qfhjq8k_.arc
113     1    116     A 29.DEC.2007 23:37:27 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_30/o1_mf_1_116_3qj281j8_.arc
114     1    117     A 30.DEC.2007 23:09:20 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2007_12_31/o1_mf_1_117_3qllqy7d_.arc
115     1    118     A 31.DEC.2007 22:03:09 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_01/o1_mf_1_118_3qmgq0w1_.arc
116     1    119     A 01.JAN.2008 06:00:32 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_01/o1_mf_1_119_3qochbm6_.arc
117     1    120     A 01.JAN.2008 23:17:30 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_02/o1_mf_1_120_3qq2r4wj_.arc
118     1    121     A 02.JAN.2008 15:00:51 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_02/o1_mf_1_121_3qq3f0v1_.arc
119     1    122     A 02.JAN.2008 15:12:00 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_02/o1_mf_1_122_3qq3jkpq_.arc
120     1    123     A 02.JAN.2008 15:13:53 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_03/o1_mf_1_123_3qr53rcb_.arc
121     1    124     A 03.JAN.2008 00:47:19 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_03/o1_mf_1_124_3qtj22bp_.arc
122     1    125     A 03.JAN.2008 22:06:25 /disk1/app/oracle/flash_recovery_area/10G/archivelog/2008_01_04/o1_mf_1_125_3qvtmx5c_.arc
Media recovery start SCN is 2676243
Recovery must be done beyond SCN 2676243 to clear data files fuzziness
Finished restore at 04.JAN.2008 15:58:59With VALIDATE you can be sure that you will be able to use that backup to restore your database as it reads all the files.
RMAN> restore database validate;
Starting restore at 04.JAN.2008 15:59:06
using channel ORA_SBT_TAPE_1
using channel ORA_DISK_1
channel ORA_SBT_TAPE_1: starting validation of datafile backupset
channel ORA_SBT_TAPE_1: reading from backup piece 1ij4gdbl_1_1
channel ORA_SBT_TAPE_1: restored backup piece 1
piece handle=1ij4gdbl_1_1 tag=TAG20071225T152124
channel ORA_SBT_TAPE_1: validation complete, elapsed time: 00:00:38
Finished restore at 04.JAN.2008 15:59:46I find both of them useful.

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