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这篇文章主要介绍如何使用RMAN验证备份的有效性，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
RMAN提供VALIDATE的命令，可以用于校验备份集的有效性，常用命令如下：
restore validate controlfile;
restore validate database;
验证命令会建议备份的存在性、完好性和可恢复性，帮助我们确认备份的有效与否。
比如验证控制文件和参数文件：
RMAN> restore validate controlfile;
Starting restore at 25-JAN-10
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=388 devtype=DISK
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /opt/oracle/product/db10g/dbs/c-1341966532-20100125-01
channel ORA_DISK_1: restored backup piece 1
piece handle=/opt/oracle/product/db10g/dbs/c-1341966532-20100125-01 tag=TAG20100125T094817
channel ORA_DISK_1: validation complete, elapsed time: 00:00:02
Finished restore at 25-JAN-10
RMAN> restore validate spfile;
Starting restore at 25-JAN-10
using channel ORA_DISK_1
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /opt/oracle/product/db10g/dbs/c-1341966532-20100116-00
channel ORA_DISK_1: restored backup piece 1
piece handle=/opt/oracle/product/db10g/dbs/c-1341966532-20100116-00 tag=TAG20100116T033113
channel ORA_DISK_1: validation complete, elapsed time: 00:00:02
Finished restore at 25-JAN-10
验证全备份一般会很慢，谨慎试验：
RMAN> restore validate database;
Starting restore at 25-JAN-10
using channel ORA_DISK_1
data file 22 will be created automatically during restore operation
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4691
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4691 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:02:36
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4692
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4692 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:01:45
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4693
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4693 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:00:26
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4694
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4694 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:00:56
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4695
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4695 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4696
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4696 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:00:04
channel ORA_DISK_1: starting validation of datafile backupset
channel ORA_DISK_1: reading from backup piece /data3/ordrbak/orderfullback_order_20100124_4697
channel ORA_DISK_1: restored backup piece 1
piece handle=/data3/ordrbak/orderfullback_order_20100124_4697 tag=order
channel ORA_DISK_1: validation complete, elapsed time: 00:00:07
failover to previous backup
data file 22 will be created automatically during restore operation
Finished restore at 25-JAN-10
验证命令并不会真正执行恢复，所以可以减去异机测试等的麻烦。
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