Testing recovery process.

Question

Hi All,
DB -10.2.0.2.0
We frequently perform database refreshes'es. this time, we have to perform time based refresh
till 31-aug-09 11:00AM. following are the sequence date and timestamp extracted from v$archived_log
in that case, whaich is the sequence, we have to use while performing time based recovery.
One more question, for database refresh, we move dbf's and archive fom source to target.
Now, before performing recovery, is there anyway to test out, weather we have required archives
and dbf's. I recently read Arup's book that we can do this, but I am not sure, weather this can
be achieved in user managed backups hot backups.
Also, after performing time based recovery, how
can we know, till what time the databsae being recovered.
You swift reply would be highly appricaited.
272193 30-08-2009 09:11:49
272194 30-08-2009 23:15:15
272195 30-08-2009 23:15:17
272196 31-08-2009 02:33:51
272197 31-08-2009 06:33:15
272198 31-08-2009 08:50:39
272199 31-08-2009 10:06:57
272200 31-08-2009 10:19:30
272201 31-08-2009 10:42:30
272202 31-08-2009 11:13:50
272203 31-08-2009 11:15:02
272204 31-08-2009 11:18:45
272205 31-08-2009 11:23:29hare krishna

Answer 1

RMAN> backup database;
Starting backup at 16-SEP-09
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/mmi/system01.dbf
input datafile file number=00002 name=/u01/app/oracle/oradata/mmi/sysaux01.dbf
input datafile file number=00003 name=/u01/app/oracle/oradata/mmi/undotbs01.dbf
input datafile file number=00005 name=/u01/app/oracle/oradata/mmi/mydatafile.dbf
input datafile file number=00004 name=/u01/app/oracle/oradata/mmi/users01.dbf
channel ORA_DISK_1: starting piece 1 at 16-SEP-09
channel ORA_DISK_1: finished piece 1 at 16-SEP-09
piece handle=/u01/app/oracle/flash_recovery_area/MMI/backupset/2009_09_16/o1_mf_nnndf_TAG20090916T134511_5c19dv9q_.bkp tag=TAG20090916T134511 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:45
Finished backup at 16-SEP-09
Starting Control File and SPFILE Autobackup at 16-SEP-09
piece handle=/u01/app/oracle/flash_recovery_area/MMI/autobackup/2009_09_16/o1_mf_s_697729560_5c19gcmc_.bkp comment=NONE
Finished Control File and SPFILE Autobackup at 16-SEP-09
RMAN> sql 'alter system archive log current';
sql statement: alter system archive log current
RMAN> sql 'alter system archive log current';
sql statement: alter system archive log current
RMAN> sql 'alter system archive log current';
sql statement: alter system archive log current
RMAN> shutdown abort
Oracle instance shut down
RMAN> exit
Recovery Manager complete.
[oracle@khurram ~]$ rm -rf /u01/app/oracle/oradata/mmi/*
[oracle@khurram ~]$ rman target /
Recovery Manager: Release 11.1.0.6.0 - Production on Wed Sep 16 13:47:35 2009
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
connected to target database (not started)
RMAN> startup nomount
Oracle instance started
Total System Global Area    1620115456 bytes
Fixed Size                     2144864 bytes
Variable Size                721421728 bytes
Database Buffers             889192448 bytes
Redo Buffers                   7356416 bytes
RMAN> restore controlfile from autobackup;
Starting restore at 16-SEP-09
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=153 device type=DISK
recovery area destination: /u01/app/oracle/flash_recovery_area
database name (or database unique name) used for search: MMI
channel ORA_DISK_1: AUTOBACKUP /u01/app/oracle/flash_recovery_area/MMI/autobackup/2009_09_16/o1_mf_s_697729560_5c19gcmc_.bkp found in the recovery area
AUTOBACKUP search with format "%F" not attempted because DBID was not set
channel ORA_DISK_1: restoring control file from AUTOBACKUP /u01/app/oracle/flash_recovery_area/MMI/autobackup/2009_09_16/o1_mf_s_697729560_5c19gcmc_.bkp
channel ORA_DISK_1: control file restore from AUTOBACKUP complete
output file name=/u01/app/oracle/oradata/mmi/control01.ctl
output file name=/u01/app/oracle/oradata/mmi/control02.ctl
output file name=/u01/app/oracle/oradata/mmi/control03.ctl
Finished restore at 16-SEP-09
RMAN> alter database mount;
database mounted
released channel: ORA_DISK_1From another terminal come at SQL
[oracle@khurram ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.1.0.6.0 - Production on Wed Sep 16 13:49:14 2009
Copyright (c) 1982, 2007, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> set linesize 1000
SQL> select substr(name,1,50) fname,checkpoint_change#,last_change#,status
  2    from v$datafile;
FNAME                                              CHECKPOINT_CHANGE# LAST_CHANGE# STATUS
/u01/app/oracle/oradata/mmi/system01.dbf                      1350307              SYSTEM
/u01/app/oracle/oradata/mmi/sysaux01.dbf                      1350307              ONLINE
/u01/app/oracle/oradata/mmi/undotbs01.dbf                     1350307              ONLINE
/u01/app/oracle/oradata/mmi/users01.dbf                       1350307              ONLINE
/u01/app/oracle/oradata/mmi/mydatafile.dbf                    1350307              ONLINEhere you can see that within control file repositry the datafiles START SCN (CHECKPOINT_SCHANGE#) is 1350307,whenever checkpoints occur, Oracle writes a START SCN to the data file headers as well it writes the START SCN within controlfile for each datafile.The control file also maintains another SCN value for each data fil with START SCN is the STOP SCN, this STOP SCN is usually null (infinity) when yours database status is open and datafile status is online , the null status shows that recovery will start from START SCN and will goes to the end of redo thread.The STO SCN here is LAST_CHANGE#
RMAN> restore database;
Starting restore at 16-SEP-09
Starting implicit crosscheck backup at 16-SEP-09
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=152 device type=DISK
Crosschecked 1 objects
Finished implicit crosscheck backup at 16-SEP-09
Starting implicit crosscheck copy at 16-SEP-09
using channel ORA_DISK_1
Finished implicit crosscheck copy at 16-SEP-09
searching for all files in the recovery area
cataloging files...
cataloging done
List of Cataloged Files
=======================
File Name: /u01/app/oracle/flash_recovery_area/MMI/autobackup/2009_09_16/o1_mf_s_697729560_5c19gcmc_.bkp
File Name: /u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_1_5c19gzs5_.arc
File Name: /u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_2_5c19h2m0_.arc
File Name: /u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_3_5c19h4tk_.arc
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/mmi/system01.dbf
channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/mmi/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/mmi/undotbs01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/mmi/users01.dbf
channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/mmi/mydatafile.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/oracle/flash_recovery_area/MMI/backupset/2009_09_16/o1_mf_nnndf_TAG20090916T134511_5c19dv9q_.bkp
channel ORA_DISK_1: piece handle=/u01/app/oracle/flash_recovery_area/MMI/backupset/2009_09_16/o1_mf_nnndf_TAG20090916T134511_5c19dv9q_.bkp tag=TAG20090916T134511
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:45
Finished restore at 16-SEP-09
SQL> select substr(name,1,50) fname,checkpoint_change#,last_change#,status
  2    from v$datafile;
FNAME                                              CHECKPOINT_CHANGE# LAST_CHANGE# STATUS
/u01/app/oracle/oradata/mmi/system01.dbf                      1350307              SYSTEM
/u01/app/oracle/oradata/mmi/sysaux01.dbf                      1350307              ONLINE
/u01/app/oracle/oradata/mmi/undotbs01.dbf                     1350307              ONLINE
/u01/app/oracle/oradata/mmi/users01.dbf                       1350307              ONLINE
/u01/app/oracle/oradata/mmi/mydatafile.dbf                    1350307              ONLINENow recover
RMAN> recover database;
Starting recover at 16-SEP-09
using channel ORA_DISK_1
starting media recovery
archived log for thread 1 with sequence 1 is already on disk as file /u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_1_5c19gzs5_.arc
archived log for thread 1 with sequence 2 is already on disk as file /u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_2_5c19h2m0_.arc
archived log for thread 1 with sequence 3 is already on disk as file /u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_3_5c19h4tk_.arc
archived log file name=/u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_1_5c19gzs5_.arc thread=1 sequence=1
archived log file name=/u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_2_5c19h2m0_.arc thread=1 sequence=2
archived log file name=/u01/app/oracle/flash_recovery_area/MMI/archivelog/2009_09_16/o1_mf_1_3_5c19h4tk_.arc thread=1 sequence=3
unable to find archived log
archived log thread=1 sequence=4
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 09/16/2009 13:51:44
RMAN-06054: media recovery requesting unknown archived log for thread 1 with sequence 4 and starting SCN of 1350423
SQL> select substr(name,1,50) fname,checkpoint_change#,last_change#,status
  2    from v$datafile;
FNAME                                              CHECKPOINT_CHANGE# LAST_CHANGE# STATUS
/u01/app/oracle/oradata/mmi/system01.dbf                      1350423              SYSTEM
/u01/app/oracle/oradata/mmi/sysaux01.dbf                      1350423              ONLINE
/u01/app/oracle/oradata/mmi/undotbs01.dbf                     1350423              ONLINE
/u01/app/oracle/oradata/mmi/users01.dbf                       1350423              ONLINE
/u01/app/oracle/oradata/mmi/mydatafile.dbf                    1350423              ONLINEHere you can see that within controlfile repositry there is datafile header START SCN which was 1350307 after restore,when you started recovery now its
SCN is 1350423 which shows that yours recovery process start from SCN 1350307 and ends at 1350423.
Khurram