从磁带中直接恢复归档日志时，出现了这个错误信息。
归档日志前后备份了两次，一次是在备份数据库后做的，另一次是凌晨7点左右进行的，其中第二次备份包含的归档日志比第一次多，最近的归档日志文件备份信息如下：
BS KEY SIZE Device TYPE Elapsed TIME Completion TIME ------- ---------- ----------- ------------ ------------------- 37761 3.18G SBT_TAPE 00:01:22 2011-08-27 03:22:37 BP KEY: 37761 STATUS: AVAILABLE Compressed: NO Tag: TAG20110827T032114 Handle: al_43199_1_760245675 Media: List OF Archived Logs IN backup SET 37761 Thrd Seq Low SCN Low TIME NEXT SCN NEXT TIME ---- ------- ---------- ------------------- ---------- --------- 1 132214 10200825285755 2011-08-27 00:35:39 10200825450980 2011-08-27 00:40:04 1 132215 10200825450980 2011-08-27 00:40:04 10200825451525 2011-08-27 00:40:06 1 132216 10200825451525 2011-08-27 00:40:06 10200826640012 2011-08-27 01:05:42 1 132217 10200826640012 2011-08-27 01:05:42 10200828085370 2011-08-27 02:08:11 1 132218 10200828085370 2011-08-27 02:08:11 10200831622590 2011-08-27 03:05:09 1 132219 10200831622590 2011-08-27 03:05:09 10200831803462 2011-08-27 03:21:02 1 132220 10200831803462 2011-08-27 03:21:02 10200831803603 2011-08-27 03:21:12 BS KEY SIZE Device TYPE Elapsed TIME Completion TIME ------- ---------- ----------- ------------ ------------------- 37763 4.22G SBT_TAPE 00:06:40 2011-08-27 07:12:26 BP KEY: 37763 STATUS: AVAILABLE Compressed: NO Tag: TAG20110827T070545 Handle: al_43201_1_760259146 Media: List OF Archived Logs IN backup SET 37763 Thrd Seq Low SCN Low TIME NEXT SCN NEXT TIME ---- ------- ---------- ------------------- ---------- --------- 1 132214 10200825285755 2011-08-27 00:35:39 10200825450980 2011-08-27 00:40:04 1 132215 10200825450980 2011-08-27 00:40:04 10200825451525 2011-08-27 00:40:06 1 132216 10200825451525 2011-08-27 00:40:06 10200826640012 2011-08-27 01:05:42 1 132217 10200826640012 2011-08-27 01:05:42 10200828085370 2011-08-27 02:08:11 1 132218 10200828085370 2011-08-27 02:08:11 10200831622590 2011-08-27 03:05:09 1 132219 10200831622590 2011-08-27 03:05:09 10200831803462 2011-08-27 03:21:02 1 132220 10200831803462 2011-08-27 03:21:02 10200831803603 2011-08-27 03:21:12 1 132221 10200831803603 2011-08-27 03:21:12 10200839298501 2011-08-27 05:59:17 1 132222 10200839298501 2011-08-27 05:59:17 10200851993798 2011-08-27 07:05:40 1 132223 10200851993798 2011-08-27 07:05:40 10200851993847 2011-08-27 07:05:44 |
而且这两个备份并不在同一个磁带中，前面的一份归档备份和全库备份同处于一个磁带中，因此在恢复的过程中，直接将这盘磁带取出，在另一台服务器上进行恢复。
全库的还原没有碰到问题，但是恢复归档日志则碰到了下面的错误：
RMAN> run 2> { 3> ALLOCATE CHANNEL ch00 TYPE 'SBT_TAPE'; 4> SEND 'NB_ORA_SERV=nbusrv, NB_ORA_CLIENT=ccicdbsrv5'; 5> restore archivelog FROM SEQUENCE 132214 until SEQUENCE 132220; 6> RELEASE CHANNEL ch00; 7> } allocated channel: ch00 channel ch00: sid=1630 devtype=SBT_TAPE channel ch00: Veritas NetBackup FOR Oracle - Release 6.5 (2007072323) sent command TO channel: ch00 Starting restore at 2011-09-11 21:03:48 channel ch00: starting archive log restore TO DEFAULT destination channel ch00: restoring archive log archive log thread=1 SEQUENCE=132214 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132215 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132216 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132217 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132218 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132219 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132220 channel ch00: reading FROM backup piece al_43201_1_760259146 ORA-19870: error reading backup piece al_43201_1_760259146 ORA-19507: failed TO retrieve sequential file, handle="al_43201_1_760259146", parms="" ORA-27029: skgfrtrv: sbtrestore returned error ORA-19511: Error received FROM media manager layer, error text: Failed TO OPEN backup file FOR restore. failover TO previous backup channel ch00: starting archive log restore TO DEFAULT destination channel ch00: restoring archive log archive log thread=1 SEQUENCE=132214 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132215 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132216 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132217 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132218 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132219 channel ch00: restoring archive log archive log thread=1 SEQUENCE=132220 channel ch00: reading FROM backup piece al_43199_1_760245675 ORA-19870: error reading backup piece al_43199_1_760245675 ORA-19507: failed TO retrieve sequential file, handle="al_43199_1_760245675", parms="" ORA-27029: skgfrtrv: sbtrestore returned error ORA-19511: Error received FROM media manager layer, error text: Failed TO process backup file <al_43199_1_760245675> failover TO previous backup released channel: ch00 RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure OF restore command at 09/11/2011 21:04:30 RMAN-06026: SOME targets NOT found - aborting restore RMAN-06025: no backup OF log thread 1 seq 132220 lowscn 10200831803462 found TO restore RMAN-06025: no backup OF log thread 1 seq 132219 lowscn 10200831622590 found TO restore RMAN-06025: no backup OF log thread 1 seq 132218 lowscn 10200828085370 found TO restore RMAN-06025: no backup OF log thread 1 seq 132217 lowscn 10200826640012 found TO restore RMAN-06025: no backup OF log thread 1 seq 132216 lowscn 10200825451525 found TO restore RMAN-06025: no backup OF log thread 1 seq 132215 lowscn 10200825450980 found TO restore RMAN-06025: no backup OF log thread 1 seq 132214 lowscn 10200825285755 found TO restore |
由于要恢复的归档日志在两个备份集中存在，因此RMAN尝试了两次进行恢复。第一次寻找al_43201_1_760259146文件，由于这个文件不在当前的磁带中，恢复失败是正常的，但是al_43199_1_760245675文件就存放在当前的磁带中，而仍然出现无法获取文件的错误就不正常了。
考虑到恢复环境和备份环境并不一致，备份时使用的带库而当前仅包含一个磁带，且磁带的catalog信息很可能也没有导入，因此对于源数据的查找可能存在问题。
通过CHANGE BACKUP TAG ‘TAG20110827T070545’ UNAVAILABLE的方式，避免恢复过程中去寻找目前并不存在的备份。再次使用RMAN执行同样的恢复操作，这次恢复成功。
恢复应该在和备份等同条件下进行，否则至少应该保证带库的CATALOG数据导入，否则就可能出现这种跨磁带查找文件时出现的错误，而利用RMAN直接在当前的磁带中扫描文件则不受影响。