RMAN-06054: media recovery requesting unknown archived log for thread

使用rman执行recover database 的时候出现RMAN-06054的错误提示：

RMAN> recover database;

Starting recover at 21-OCT-14

using channel ORA_DISK_1

starting media recovery

archived log for thread 1 with sequence 1 is already on disk as file /u01/app/archivelog/dest2/1_1_861389770.dbf

archived log for thread 1 with sequence 2 is already on disk as file /u01/app/archivelog/dest1/1_2_861389770.dbf

archived log for thread 1 with sequence 3 is already on disk as file /u01/app/archivelog/dest1/1_3_861389770.dbf

archived log for thread 1 with sequence 4 is already on disk as file /u01/app/archivelog/dest1/1_4_861389770.dbf

archived log for thread 1 with sequence 5 is already on disk as file /u01/app/archivelog2/dest1/1_5_861389770.dbf

archived log for thread 1 with sequence 6 is already on disk as file /u01/app/archivelog2/dest1/1_6_861389770.dbf

archived log file name=/u01/app/archivelog/dest2/1_1_861389770.dbf thread=1 sequence=1

archived log file name=/u01/app/archivelog/dest1/1_2_861389770.dbf thread=1 sequence=2

archived log file name=/u01/app/archivelog/dest1/1_3_861389770.dbf thread=1 sequence=3

archived log file name=/u01/app/archivelog/dest1/1_4_861389770.dbf thread=1 sequence=4

archived log file name=/u01/app/archivelog2/dest1/1_5_861389770.dbf thread=1 sequence=5

archived log file name=/u01/app/archivelog2/dest1/1_6_861389770.dbf thread=1 sequence=6

unable to find archived log

archived log thread=1 sequence=7

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of recover command at 10/21/2014 01:28:11

RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 7 and starting SCN of 2292709

在11g官方文档error messages中对错误描述如下：
RMAN-06054: media recovery requesting unknown archived log for thread string with sequence string and starting SCN of string

Cause: Media recovery is requesting a log whose existence is not recorded in the recovery catalog or target database control file.

Action: If a copy of the log is available, then add it to the recovery catalog and/or control file via a CATALOG command and then retry the RECOVER command. If not, then a point-in-time recovery up to the missing log is the only alternative and database can be opened using ALTER DATABASE OPEN RESETLOGS command.

可见，出先此错误的原因是恢复需要的日志记录在控制文件或恢复目录中找不到。解决方法分两种情况：
1.如果相关的日志存在且可用的话，就将此日志记录添加到控制文件或恢复目录中。
2.如果相关的日志已经被删除了或不可用了，那么就按照错误的提示scn将数据库恢复到此scn，本案例是2292709。也就是说此时数据库只能进行不完全恢复了，在打开数据库时得使用resetlogs打开。

RMAN> recover database until scn 2292709;

Starting recover at 21-OCT-14

using channel ORA_DISK_1

starting media recovery

media recovery complete, elapsed time: 00:00:00