RAC instance, trying to recover UNDO datafile, RMAN gives RMAN-06054

Question

Hello all,
This has been a troublesome instance..a quick bit of background. This was created awhile back by someone else, I inherited this 3 mode RAC clusterof instance1.
I'm exporting out of one database (10G) into this instance1 (11G). When I was about to start the import..I found this instance wouldn't start. Turned out no backup had been going on of this empty instance. I backed up the archive logs to tape to free up the FRA..and things fired up.
I began the import, and found a bunch of errors...basically tellling me that I couldn't access one of the undo tablespaces...datafile problems.
I went to look and saw:
SQL> select a.file_name, a.file_id, b.status, a.tablespace_name
     2 from dba_data_files a, v$datafile b
     3 where a.file_id = b.file#
     4 order by a.file_name;
     FILE_NAME FILE_ID STATUS TABLESPACE_NAME
     +DATADG/instance1/datafile/sysaux.270.696702269              2 ONLINE                SYSAUX
     +DATADG/instance1/datafile/system.263.696702253              1 SYSTEM                SYSTEM
     +DATADG/instance1/datafile/undotbs1.257.696702279            3 ONLINE                UNDOTBS1
     +DATADG/instance1/datafile/undotbs2.266.696702305            4 ONLINE                UNDOTBS2
     +DATADG/instance1/datafile/undotbs3.269.696702313            5 RECOVER               UNDOTBS3
     +DATADG/instance1/datafile/users.268.696702321               6 ONLINE                USERS
     +DATADG/instance1/l_data_01_01                              11 ONLINE                L_DATA_01
     +DATADG/instance1/s_data_01_01                               7 ONLINE                S_DATA_01
     +DATADG/instance1/s_data_01_02                               8 ONLINE                S_DATA_01
     +INDEXDG/instance1/l_index_01_01                            12 ONLINE                L_INDEX_01
     +INDEXDG/instance1/s_index_01_01                             9 ONLINE                S_INDEX_01
     FILE_NAME FILE_ID STATUS TABLESPACE_NAME
     +INDEXDG/instance1/s_index_01_02                            10 ONLINE                S_INDEX_01
There is is, file #5.
So, I went into RMAN to try to restore/recover:
RMAN> restore datafile 5;
Starting restore at 06-APR-10
allocated channel: ORA_SBT_TAPE_1
channel ORA_SBT_TAPE_1: SID=222 instance=instance1 device type=SBT_TAPE
channel ORA_SBT_TAPE_1: NMO v4.5.0.0
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=222 instance=instance1 device type=DISK
creating datafile file number=5 name=+DATADG/instance1/datafile/undotbs3.269.696702313
restore not done; all files read only, offline, or already restored
Finished restore at 06-APR-10
RMAN> recover datafile 5;
Starting recover at 06-APR-10
using channel ORA_SBT_TAPE_1
using channel ORA_DISK_1
starting media recovery
RMAN-06560: WARNING: backup set with key 343546 will be read 2 times
available space of 8315779 kb needed to avoid reading the backup set multiple times
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 04/06/2010 14:33:07
RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 1 and starting SCN of 16016
This is all on ASM, and am a bit of a newb with that. I bascially have no data I'm worried about losing, I just need to get everything 'on the air' so I can import successfully, and let users on this instance. I've set up the backups in GRID now....so, it will be backed up on the future, but what is the quickest, most efficient way to get this UNDO tablespace datafile recovered?
Thank you,
cayenne

Answer 1

Hemant K Chitale wrote:
SET UNTIL SEQUENCE 27wouldn't work if the Recovery requires Sequence 1 and it is missing.
Hemant K ChitaleOops...meant to have start and set until both to "1"
However, I see what you mean. It seems I cannot find the file on tape.
Since the RAC instance hasn't yet had any data put into it, I'm thinking it might be best to just blow it away, and recreate everything.
Trouble is, I'm a bit new at RAC and ASM. I was thinking the best route might be to use DBCA to remove the database...? Would this not take care of removing all the datafiles from all the ASM instances on the RAC..as well as all the other directories, etc on all 3x nodes?
I've already used the dbca to create templates of this instance, so recreation shouldn't be too difficult (although it will be my first RAC creation)...
Thank you in advance for the advice so far,
cayenne