NBU在归档不全或者是被删除后，在备份的时候会报错：
Detail Status:
2014-11-7 6:17:35 - requesting resource sddb-nbu-hcart3-robot-tld-0
2014-11-7 6:17:35 - requesting resource sddb-nbu.NBU_CLIENT.MAXJOBS.testdb
2014-11-7 6:17:35 - requesting resource sddb-nbu.NBU_POLICY.MAXJOBS.testa
2014-11-7 6:17:35 - granted resource sddb-nbu.NBU_CLIENT.MAXJOBS.testdb
2014-11-7 6:17:35 - granted resource sddb-nbu.NBU_POLICY.MAXJOBS.testa
2014-11-7 6:17:35 - granted resource sddb-nbu-hcart3-robot-tld-0
2014-11-7 6:17:35 - estimated 0 kbytes needed
2014-11-7 6:17:35 - started process bpbrm (19072)
2014-11-7 6:17:37 - connecting
2014-11-7 6:17:37 - connected; connect time: 00:00:00
2014-11-7 6:25:06 - end writing
the backup failed to back up the requested files(6)
2014-11-7 6:25:06 - end writing
the backup failed to back up the requested files(6)
解决方法：
重新检查归档日志。
操作：
RMAN>
crosscheck archivelog all;
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=985 devtype=DISK
validation failed for archived log
------归档被删除验证失败
archive log filename=/yyarchlog/1_3750_842737622.dbf recid=3563 stamp=862839417
validation failed for archived log
------归档被删除验证失败
archive log filename=/yyarchlog/1_3751_842737622.dbf recid=3564 stamp=862839460
validation failed for archived log
------归档被删除验证失败
archive log filename=/yyarchlog/1_3752_842737622.dbf recid=3565 stamp=862843017
validation failed for archived log
------归档被删除验证失败
archive log filename=/yyarchlog/1_3948_842737622.dbf recid=3761 stamp=863014582
validation succeeded for archived log
archive log filename=/yyarchlog/1_3949_842737622.dbf recid=3762 stamp=863014616
Crosschecked 200 objects
检查完成后立即发起备份，看一下是否OK？
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