Restore Datafile using RMAN backup
When for some reason a datafile is lost and RMAN is in place. You might want to recover the file using the RMAN restore option for restoring datafiles.
Here is a brief overview on how to proceed.
oracle@xxx: $ ls -ltr
total 1656572
-rw-r—– 1 oracle oinstall 20979712 Jul 11 06:00 temp01.dbf
-rw-r—– 1 oracle oinstall 52429312 Jul 12 22:01 redo01.log
-rw-r—– 1 oracle oinstall 262152192 Jul 12 22:02 users01.dbf
-rw-r—– 1 oracle oinstall 52429312 Jul 12 22:02 redo03.log
-rw-r—– 1 oracle oinstall 199237632 Jul 13 08:29 sysaux01.dbf
-rw-r—– 1 oracle oinstall 209723392 Jul 13 08:50 undotbs01.dbf
-rw-r—– 1 oracle oinstall 314580992 Jul 13 08:50 system01.dbf
-rw-r—– 1 oracle oinstall 536879104 Jul 13 08:54 xwiki01.dbf
-rw-r—– 1 oracle oinstall 52429312 Jul 13 08:54 redo02.log
-rw-r—– 1 oracle oinstall 7094272 Jul 13 08:54 control03.ctl
-rw-r—– 1 oracle oinstall 7094272 Jul 13 08:54 control01.ctl
oracle@xxx: $ rm xwiki01.dbf
Here we are 1 datafile short !
oracle@xxx: $ ls -ltr
total 1656572
-rw-r—– 1 oracle oinstall 20979712 Jul 11 06:00 temp01.dbf
-rw-r—– 1 oracle oinstall 52429312 Jul 12 22:01 redo01.log
-rw-r—– 1 oracle oinstall 262152192 Jul 12 22:02 users01.dbf
-rw-r—– 1 oracle oinstall 52429312 Jul 12 22:02 redo03.log
-rw-r—– 1 oracle oinstall 199237632 Jul 13 08:29 sysaux01.dbf
-rw-r—– 1 oracle oinstall 209723392 Jul 13 08:50 undotbs01.dbf
-rw-r—– 1 oracle oinstall 314580992 Jul 13 08:50 system01.dbf
-rw-r—– 1 oracle oinstall 52429312 Jul 13 08:54 redo02.log
-rw-r—– 1 oracle oinstall 7094272 Jul 13 08:54 control03.ctl
-rw-r—– 1 oracle oinstall 7094272 Jul 13 08:54 control01.ctl
First connect to your RMAN “catalog” and list backup to find the datafile number to restore.
oracle@xxx: $ $ORACLE_HOME/bin/rman
Recovery Manager: Release 10.2.0.1.0 – Production on Mon Jul 13 08:54:59 2009
Copyright (c) 1982, 2005, Oracle. All rights reserved.
RMAN> connect target;
connected to target database: XWIKI (DBID=675473154)
RMAN> list backup;
using target database control file instead of recovery catalog
List of Backup Sets
===================BS Key Type LV Size Device Type Elapsed Time Completion Time
——- —- — ———- ———– ———— —————
82 Full 137.80M DISK 00:00:55 06-JUL-09
BP Key: 82 Status: AVAILABLE Compressed: NO Tag: TAG20090706T220341
Piece Name: /u04/backup/XWIKI/rman/backup_df_88_691538622.bak
List of Datafiles in backup set 82
File LV Type Ckp SCN Ckp Time Name
—- — —- ———- ——— —-
1 Full 2127473 06-JUL-09 /u02/oradata/xwiki/system01.dbfBS Key Type LV Size Device Type Elapsed Time Completion Time
——- —- — ———- ———– ———— —————
84 Full 76.31M DISK 00:00:59 06-JUL-09
BP Key: 84 Status: AVAILABLE Compressed: NO Tag: TAG20090706T220341
Piece Name: /u04/backup/XWIKI/rman/backup_df_86_691538622.bak
List of Datafiles in backup set 84
File LV Type Ckp SCN Ckp Time Name
—- — —- ———- ——— —-
5 Full 2127471 06-JUL-09 /u02/oradata/xwiki/xwiki01.dbf..
…
..BS Key Type LV Size Device Type Elapsed Time Completion Time
——- —- — ———- ———– ———— —————
141 Full 6.83M DISK 00:00:00 12-JUL-09
BP Key: 141 Status: AVAILABLE Compressed: NO Tag: TAG20090712T220211
Piece Name: /u04/backup/XWIKI/rman/c-675473154-20090712-00
Control File Included: Ckp SCN: 2330680 Ckp time: 12-JUL-09
SPFILE Included: Modification time: 08-JUL-09RMAN>
We know now that datafile 5 is the one to restore. Before we can proceed we need to put it offline.
RMAN> SQL ‘ALTER DATABASE DATAFILE 5 OFFLINE’;
sql statement: ALTER DATABASE DATAFILE 5 OFFLINE
RMAN>
Now that the datafile is offline , we are ready for the RMAN datafile restore.
RMAN> RESTORE DATAFILE 5;
Starting restore at 13-JUL-09
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=141 devtype=DISK
allocated channel: ORA_DISK_2
channel ORA_DISK_2: sid=140 devtype=DISK
allocated channel: ORA_DISK_3
channel ORA_DISK_3: sid=149 devtype=DISK
allocated channel: ORA_DISK_4
channel ORA_DISK_4: sid=139 devtype=DISKchannel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00005 to /u02/oradata/xwiki/xwiki01.dbf
channel ORA_DISK_1: reading from backup piece /u04/backup/XWIKI/rman/backup_df_142_692056911.bak
channel ORA_DISK_1: restored backup piece 1
piece handle=/u04/backup/XWIKI/rman/backup_df_142_692056911.bak tag=TAG20090712T220151
channel ORA_DISK_1: restore complete, elapsed time: 00:00:16
Finished restore at 13-JUL-09RMAN>
At this point we are not yet ready to put the datafile back online
RMAN> SQL ‘ALTER DATABASE DATAFILE 5 ONLINE’;
sql statement: ALTER DATABASE DATAFILE 5 ONLINE
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of sql command on default channel at 07/13/2009 08:53:45
RMAN-11003: failure during parse/execution of SQL statement: ALTER DATABASE DATAFILE 5 ONLINE
ORA-01113: file 5 needs media recovery
ORA-01110: data file 5: ‘/u02/oradata/xwiki/xwiki01.dbf’
As this is an “old” datafile and not the up to date one, we need to recover the datafile to match the others. This can easily be done by executing the following.
RMAN> RECOVER DATAFILE 5;
Starting recover at 13-JUL-09
using channel ORA_DISK_1
using channel ORA_DISK_2
using channel ORA_DISK_3
using channel ORA_DISK_4starting media recovery
archive log thread 1 sequence 6 is already on disk as file /u03/oradata/xwiki/archiving/1_6_691685756.arc
archive log thread 1 sequence 7 is already on disk as file /u03/oradata/xwiki/archiving/1_7_691685756.arc
archive log thread 1 sequence 8 is already on disk as file /u03/oradata/xwiki/archiving/1_8_691685756.arc
archive log thread 1 sequence 9 is already on disk as file /u03/oradata/xwiki/archiving/1_9_691685756.arc
archive log thread 1 sequence 10 is already on disk as file /u03/oradata/xwiki/archiving/1_10_691685756.arc
archive log thread 1 sequence 11 is already on disk as file /u03/oradata/xwiki/archiving/1_11_691685756.arc
archive log thread 1 sequence 12 is already on disk as file /u03/oradata/xwiki/archiving/1_12_691685756.arc
archive log filename=/u03/oradata/xwiki/archiving/1_6_691685756.arc thread=1 sequence=6
archive log filename=/u03/oradata/xwiki/archiving/1_7_691685756.arc thread=1 sequence=7
archive log filename=/u03/oradata/xwiki/archiving/1_8_691685756.arc thread=1 sequence=8
media recovery complete, elapsed time: 00:00:03
Finished recover at 13-JUL-09RMAN>
Now that the datafile is brought up to speed, we can put our datafile online again.
RMAN> SQL ‘ALTER DATABASE DATAFILE 5 ONLINE’;
sql statement: ALTER DATABASE DATAFILE 5 ONLINE
RMAN>
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