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使用RMAN恢复一个数据库到另一个目录结构不同的数据库中

原创 Linux操作系统 作者:ljm0211 时间:2012-07-02 19:53:48 0 删除 编辑
Applies to:Oracle Server - Enterprise Edition - Version: 10.1.0.2 to 11.1.0.8
Information in this document applies to any platform.
GoalRestoring Rman backup on a different node with different backup directory structures and different database directory structures .

++ Rman backup of database is done on NODE 1.
++ The database has to be has to be restored from the Rman backup on NODE 2.
++ The directory structures for the backups and the database files are different on NODE 2.
++ The Rman backups have to put in new directory structure on NODE 2 unlike as they were on NODE 1.
++ Also the database has to be restored to a different directory structure on NODE
2.
Solution

ASSUMPTIONS
-----------------------

++ The backups on NODE 1 are done to '/node1/database/backup'
++ The database files on NODE 1 are in '/node1/database/prod'
++ The backups on NODE 2 will be in location '/node2/database/backup'
++ The database files on NODE 2 will be restored to '/node2/database/prod

Steps to acheive the goal:

1) Connect to the target database using rman and backup the database ---> ON NODE 1

$ rman target /

Recovery Manager: Release 10.2.0.1.0 - Production on Tue Feb 13 00:29:33 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: ORA10G (DBID=3932056136)


RMAN> backup database plus archivelog;


Starting backup at 13-FEB-07
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archive log backupset
channel ORA_DISK_1: specifying archive log(s) in backup set
input archive log thread=1 sequence=143 recid=109 stamp=614392105
channel ORA_DISK_1: starting piece 1 at 13-FEB-07
channel ORA_DISK_1: finished piece 1 at 13-FEB-07
piece handle=/node1/database/backup/o1_mf_annnn_TAG20070213T002825_2x21kbds
_.bkp tag=TAG20070213T002825 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:02
Finished backup at 13-FEB-07

Starting backup at 13-FEB-07
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
input datafile fno=00003 name=/node1/database/prod/sysaux01.dbf
input datafile fno=00001 name=/node1/database/prod/system01.dbf
input datafile fno=00002 name=/node1/database/prod/undotbs01.dbf
input datafile fno=00004 name=/node1/database/prod/users01.dbf
input datafile fno=00005 name=/node1/database/prod/1.dbf
input datafile fno=00006 name=/node1/database/prod/sysaux02.dbf
input datafile fno=00007 name=/node1/database/prod/undotbs02.dbf
channel ORA_DISK_1: starting piece 1 at 13-FEB-07
channel ORA_DISK_1: finished piece 1 at 13-FEB-07
piece handle=/node1/database/backup/o1_mf_nnndf_TAG20070213T002827_2x21kd12
_.bkp tag=TAG20070213T002827 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:55
Finished backup at 13-FEB-07


Starting backup at 13-FEB-07
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archive log backupset
channel ORA_DISK_1: specifying archive log(s) in backup set
input archive log thread=1 sequence=144 recid=110 stamp=614392165
channel ORA_DISK_1: starting piece 1 at 13-FEB-07
channel ORA_DISK_1: finished piece 1 at 13-FEB-07
piece handle=/node1/database/backup/o1_mf_annnn_TAG20070213T002925_2x21m6ty
_.bkp tag=TAG20070213T002925 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:02
Finished backup at 13-FEB-07


Starting Control File and SPFILE Autobackup at 13-FEB-07
piece handle=/u01/oracle/product/ora10g/dbs/c-3932056136-20070213-02 comment=NONE
Finished Control File and SPFILE Autobackup at 13-FEB-07


RMAN> exit
2) Move the following files to the NODE 2:+ The database backup pieces to location '/node2/database/backup'
+ Controlfile backup piece to the location '/node2/database/backup'
+ The parameter file i.e init.ora file to the default location i.e $ORACLE_HOME/dbs

3) Edit the PFILE on NODE 2 to change the environment specific parameters like .

user_dump_dest =
background_dump_dest =
control_files =

4) Once the PFILE is suitably modified invoke Rman on the NODE 2 after setting the Oracle environment variables and start the database in nomount mode:

[oracle@test-br test]$ export ORACLE_HOME=/u01/oracle/product/ora10g
[oracle@test-br test]$ export ORACLE_SID=ora10g
[oracle@test-br test]$ export PATH=$ORACLE_HOME/bin:$PATH
[oracle@test-br test]$ rman target /
Recovery Manager: Release 10.2.0.1.0 - Production on Tue Feb 13 00:36:55 2007
Copyright (c) 1982, 2005, Oracle.   All rights reserved.
connected to target database (not started)
RMAN> startup nomount
Oracle instance started
Total System Global Area      205520896 bytes
Fixed Size                      1218508 bytes
Variable Size                  75499572 bytes
Database Buffers              121634816 bytes
Redo Buffers                    7168000 bytes

5) Restore the controlfile from the backup piece.

RMAN> restore controlfile from   '/node2/database/backup/c-3932056136-20070213-02';
Starting restore at 13-FEB-07
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=155 devtype=DISK
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete,
elapsed time: 00:00:02
output filename=/node2/database/prod/control01.ctl
Finished restore at 13-FEB-07

6) Mount the database

RMAN > alter database mount      

7) Now catalog the backup pieces that were shipped from NODE 1

RMAN> catalog backuppiece '/node2/database/backup/o1_mf_annnn_TAG20070213T002925_2x21m6ty_.bkp';

RMAN> catalog backuppiece '/node2/database/backup/o1_mf_annnn_TAG20070213T002825_2x21kbds_.bkp';

RMAN> catalog backuppiece '/node2/database/backup/o1_mf_nnndf_TAG20070213T002827_2x21kd12_.bkp';

This feature of cataloging backup pieces is available from ORACLE 10g versions. Prior to Oracle 10g we were not able to catalog the backup pieces. For more information on cataloging options refer the metalink note 470463.1                 

8) Get to know the last sequence available in the archivelog backup using the following command.This will help us in recovering the database till that archivelog.

RMAN > list backup of archivelog all;Let us assume the last sequence of last archivelog in the backup is 50.

9) Rename the Redologfiles,so that they can be created in new locations when opened the database is opened in resetlogs

SQL> alter database rename file '/node1/database/prod/redo01.log' to '/node2/database/prod/redo01.log';
......
......
......

10) Now restore the datafiles to new locations and recover. Since we are recovering the database here till the archivelog sequence 50 the sequence number in the SET UNTIL SEQUENCE clause should be 50 (+1)

RMAN> run
{
set until sequence 51;
set newname for datafile 1 to '/node2/database/prod/sys01.dbf';
set newname for datafile 2 to '/node2/database/prod/undotbs01.dbf';
set newname for datafile 3 to '/node2/database/prod/sysaux01.dbf';
set newname for datafile 4 to '/node2/database/prod/users01.dbf';
set newname for datafile 5 to '/node2/database/prod/1.dbf';
set newname for datafile 6 to '/node2/database/prod/sysaux02.dbf';
set newname for datafile 7 to '/node2/database/prod/undotbs02.dbf';
restore database;
switch datafile all;
recover database;
alter database open resetlogs;
}

If we are restoring the Rman backups from tapes,then we should ensure the same media manager variables that were used during backups are maintained during restore too.

The below article gives the information of various media manager Environment Variables.

NOTE.312737.1 RMAN and Specific Media Managers Environment Variables.

References

Note 228257.1 - RMAN 'Duplicate Database' Feature in Oracle9i / Oracle 10G
Note 73974.1 - RMAN: Restoring an RMAN Backup to Another Node

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