RMAN-06025: no backup of log thread 1 seq 17 lowscn 1101318 found to restore

 

在恢复数据库的时候，报错：

RMAN> recover database;

 

Starting recover at 07-NOV-14

using channel ORA_DISK_1

 

starting media recovery

 

archive log thread 2 sequence 13 is already on disk as file /home/oracle/arch/2_13_858567385.arc

archive log thread 2 sequence 14 is already on disk as file /home/oracle/arch/2_14_858567385.arc

archive log thread 2 sequence 15 is already on disk as file /home/oracle/arch/2_15_858567385.arc

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

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

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

RMAN-03002: failure of recover command at 11/07/2014 07:26:19

RMAN-06053: unable to perform media recovery because of missing log

RMAN-06025: no backup of log thread 1 seq 17 lowscn 1101318 found to restore

RMAN-06025: no backup of log thread 1 seq 16 lowscn 1098429 found to restore



--查询对应的归档日志： 
SQL> select name,sequence#,first_change#
  2  from v$archived_log
  3  where first_change# in (1101318,1098429);

NAME          SEQUENCE# FIRST_CHANGE#
-------------------------------------------------- ---------- -------------
/home/oracle/arch/1_16_858567385.arc      16     1098429
/home/oracle/arch/1_17_858567385.arc      17     1101318

--查看该归档日志是否存在
oracle@rac2 arch]$ cd /home/oracle/arch
[oracle@rac2 arch]$ ls -ltr
-rw-r-----  1 oracle oinstall  621056 Nov  7 07:25 1_16_858567385.arc
-rw-r-----  1 oracle oinstall   11264 Nov  7 07:26 1_17_858567385.arc
-rw-r-----  1 oracle oinstall 1729536 Nov  7 07:36 2_16_858567385.arc

看到，这两个归档日志是物理存在的，这就奇怪了。

--查看下这两个归档日志的状态
SQL> l
  1  select name,status
  2 from v$archived_log

  3 *where first_change# in (1101318,1098429);

NAME   S

-------------------------------------------------- -

/home/oracle/arch/1_16_858567385.arc   X

/home/oracle/arch/1_17_858567385.arc   X

日志状态竟然为X，但这个归档日志明明存在呀


 
归档日志状态为X的原因：
控制文件里记录了这个归档日志的位置，当这个归档日志被移走了（即使你后来又将其移动过来了）或者删除了，该归档日志就会被标记为EXPIRED。
我出错是因为，起初rac2归档路径下没有rac1的归档日志，因此，rac1的归档日志都被标记为X（即EXPIRED)。虽然我后来通过NFS，将rac1的归档日志共享给了rac2，但此时该归档日志还是会被标记为EXPIRED。
解决办法：
当你确定该归档日志物理上存在后，crosscheck archivelog all
现在再查看状态，变成A了。
NAME   S

-------------------------------------------------- -

/home/oracle/arch/1_16_858567385.arc   A

/home/oracle/arch/1_17_858567385.arc A


 
然后恢复数据库，也不报错了：
 
RMAN> recover database;

 

Starting recover at 07-NOV-14

using channel ORA_DISK_1

 

starting media recovery

 

archive log thread 1 sequence 16 is already on disk as file /home/oracle/arch/1_16_858567385.arc

archive log thread 1 sequence 17 is already on disk as file /home/oracle/arch/1_17_858567385.arc

archive log thread 2 sequence 13 is already on disk as file /home/oracle/arch/2_13_858567385.arc

archive log thread 2 sequence 14 is already on disk as file /home/oracle/arch/2_14_858567385.arc

archive log thread 2 sequence 15 is already on disk as file /home/oracle/arch/2_15_858567385.arc

archive log filename=/home/oracle/arch/2_13_858567385.arc thread=2 sequence=13

archive log filename=/home/oracle/arch/1_16_858567385.arc thread=1 sequence=16

archive log filename=/home/oracle/arch/2_14_858567385.arc thread=2 sequence=14

media recovery complete, elapsed time: 00:00:05

Finished recover at 07-NOV-14



 
总结：
造成这个错误的原因：
1：该归档日志物理上被删除了；
2：该归档日志物理上存在，但被标记为了expired状态；