Recover datafile doubt

Question

After did a switchover(DataGuard), on my current primary database I did a level 0 backup RMAN and it did not end due to an error with an datafile that needs recover, specifically the datafile 2 (sysaux tablespace). The last level 0 backup I have is 9 days ago. The first thing I do was restore the datafile and try to recover it.
RMAN> run{sql 'alter database datafile 2 offline';  restore datafile 2; recover datafile 2;}
The second step (recover) show me the following error:
unable to find archived log
archived log thread=1 sequence=1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 08/17/2010 12:19:01
RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 1 and starting SCN of 1757
I appreciate any help, thank you.

Answer 1

Dear user12100209,
Please see the error message;
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.So what i am thinking is that is happening because of a missing archivelog metadata(information) in the standby controlfile.
Below link may give you a general information;
http://download.oracle.com/docs/cd/E11882_01/backup.112/e10642/rcmadvre.htm#BRADV89834
Hope That Helps.
Ogan