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24 March, 2012

Relocating a datafile using RMAN

RMAN can be used to relocate a datafile.

I start with the datafile present in /home/oracle/app/oracle/oradata/orcl/
SQL> select tablespace_name, file_id, file_name
  2  from dba_data_files 
  3  where file_name like '%add%';

TABLESPACE_NAME                   FILE_ID
------------------------------ ----------
FILE_NAME
--------------------------------------------------------------------------------
ADD_TBS                                14
/home/oracle/app/oracle/oradata/orcl/add_tbs.dbf


SQL> 
I would now like to relocate this to /oradata/orcl. I use RMAN thus :
RMAN> sql 'alter tablespace add_tbs offline'; 

using target database control file instead of recovery catalog
sql statement: alter tablespace add_tbs offline

RMAN> 
RMAN> copy datafile 14 to '/oradata/orcl/add_tbs_01.dbf';

Starting backup at 24-MAR-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00014 name=/home/oracle/app/oracle/oradata/orcl/add_tbs.dbf
output file name=/oradata/orcl/add_tbs_01.dbf tag=TAG20120324T001024 RECID=3 STAMP=778723826
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 24-MAR-12

RMAN>
RMAN> switch datafile 14 to copy;

datafile 14 switched to datafile copy "/oradata/orcl/add_tbs_01.dbf"

RMAN> recover tablespace add_tbs;

Starting recover at 24-MAR-12
using channel ORA_DISK_1

starting media recovery
media recovery complete, elapsed time: 00:00:00

Finished recover at 24-MAR-12

RMAN> sql 'alter tablespace add_tbs online';

sql statement: alter tablespace add_tbs online

RMAN> 
That was easy -- so far.
Now ... the question is : If I do a LIST BACKUP, what appears as the location of the datafile ?  Is it /home/oacle/app/oracle/oradata/orcl  ? OR is it /oradata/orcl ?
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Let's see ...........
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RMAN> list backup of datafile 14;


List of Backup Sets
===================


BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
8       Full    487.60M    DISK        00:01:12     01-JAN-12      
        BP Key: 8   Status: AVAILABLE  Compressed: YES  Tag: TAG20120101T112516
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_01_01/o1_mf_nnndf_TAG20120101T112516_7hznjx24_.bkp
  List of Datafiles in backup set 8
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 4956816    01-JAN-12 /oradata/orcl/add_tbs_01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
18      Full    530.30M    DISK        00:01:44     23-MAR-12      
        BP Key: 18   Status: AVAILABLE  Compressed: YES  Tag: TAG20120323T231454
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_03_23/o1_mf_nnndf_TAG20120323T231454_7ps4vgmf_.bkp
  List of Datafiles in backup set 18
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 5192430    23-MAR-12 /oradata/orcl/add_tbs_01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
21      Full    530.70M    DISK        00:01:23     23-MAR-12      
        BP Key: 21   Status: AVAILABLE  Compressed: YES  Tag: TAG20120323T235528
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_03_23/o1_mf_nnndf_TAG20120323T235528_7ps77jf2_.bkp
  List of Datafiles in backup set 21
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 5194695    23-MAR-12 /oradata/orcl/add_tbs_01.dbf

RMAN> 
Apparently, Oracle now shows the *new* location of the datafile even for backups taken earlier !! How cool is that ?!

If I take a fresh backup ...
RMAN> backup datafile 14;

Starting backup at 24-MAR-12
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=00014 name=/oradata/orcl/add_tbs_01.dbf
channel ORA_DISK_1: starting piece 1 at 24-MAR-12
channel ORA_DISK_1: finished piece 1 at 24-MAR-12
piece handle=/home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_03_24/o1_mf_nnndf_TAG20120324T001527_7ps8dzm8_.bkp tag=TAG20120324T001527 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 24-MAR-12

RMAN> list backup of datafile 14;


List of Backup Sets
===================


BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
8       Full    487.60M    DISK        00:01:12     01-JAN-12      
        BP Key: 8   Status: AVAILABLE  Compressed: YES  Tag: TAG20120101T112516
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_01_01/o1_mf_nnndf_TAG20120101T112516_7hznjx24_.bkp
  List of Datafiles in backup set 8
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 4956816    01-JAN-12 /oradata/orcl/add_tbs_01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
18      Full    530.30M    DISK        00:01:44     23-MAR-12      
        BP Key: 18   Status: AVAILABLE  Compressed: YES  Tag: TAG20120323T231454
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_03_23/o1_mf_nnndf_TAG20120323T231454_7ps4vgmf_.bkp
  List of Datafiles in backup set 18
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 5192430    23-MAR-12 /oradata/orcl/add_tbs_01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
21      Full    530.70M    DISK        00:01:23     23-MAR-12      
        BP Key: 21   Status: AVAILABLE  Compressed: YES  Tag: TAG20120323T235528
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_03_23/o1_mf_nnndf_TAG20120323T235528_7ps77jf2_.bkp
  List of Datafiles in backup set 21
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 5194695    23-MAR-12 /oradata/orcl/add_tbs_01.dbf

BS Key  Type LV Size       Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
24      Full    1.23M      DISK        00:00:00     24-MAR-12      
        BP Key: 24   Status: AVAILABLE  Compressed: NO  Tag: TAG20120324T001527
        Piece Name: /home/oracle/app/oracle/flash_recovery_area/ORCL/backupset/2012_03_24/o1_mf_nnndf_TAG20120324T001527_7ps8dzm8_.bkp
  List of Datafiles in backup set 24
  File LV Type Ckp SCN    Ckp Time  Name
  ---- -- ---- ---------- --------- ----
  14      Full 5196666    24-MAR-12 /oradata/orcl/add_tbs_01.dbf

RMAN> 
Yes, BackupSet Key 24 has the latest backup, created today.

Today's question :
What is the information that Oracle stores ?  If the location of datafile 14 was under /home/oracle/app/oracle/oradata/orcl  on 01-Jan and 23-Mar, why isn't that location  presented ?Is it not stored in the repository ?  Yes, the location of the BackupPiece is evident, but the location of the datafile is "current" even when the backup was taken when the datafile was elsewhere !

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7 comments:

Narendra said...

Hemant,

(Again) I don't have answer to your question but I am wondering if recovery catalog (instead of control file) is used when the backup was taken and when the LIST BACKUP is issued, will it show the old location of datafile?

Vaibhav said...

Hi Hemant,

In case of a seperate recovery catalog also, it shows the new location.


-- get the current layout of the database

RMAN> report schema at time "to_date('26-MAR-2012 11:24:23','DD-MON-YYYY HH24:MI:SS')";

Report of database schema for database with db_unique_name ORA11PRD

List of Permanent Datafiles
===========================
File Size(MB) Tablespace RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1 700 SYSTEM YES C:\APP\WXYZ\ORADATA\ORA11PRD\SYSTEM01.DBF
2 600 SYSAUX YES C:\APP\WXYZ\ORADATA\ORA11PRD\SYSAUX01.DBF
3 300 UNDOTBS1 YES C:\APP\WXYZ\ORADATA\ORA11PRD\UNDOTBS01.DBF
4 32 USERS YES C:\APP\WXYZ\ORADATA\ORA11PRD\USERS01.DBF
5 100 TEST_TS YES C:\APP\WXYZ\ORADATA\ORA11PRD\TEST.DBF

List of Temporary Files
=======================
File Size(MB) Tablespace Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1 20 TEMP 32767 C:\APP\WXYZ\ORADATA\ORA11PRD\TEMP01.DBF


-- move the datafile 5 to a new location

RMAN> copy datafile 5 to 'c:\temp\TEST.DBF';

Starting backup at 26-MAR-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00005 name=C:\APP\WXYZ\ORADATA\ORA11PRD\TEST.DBF
output file name=C:\TEMP\TEST.DBF tag=TAG20120326T112737 RECID=3 STAMP=778937267

channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:15
Finished backup at 26-MAR-12

RMAN> switch datafile 5 to copy;

datafile 5 switched to datafile copy "C:\TEMP\TEST.DBF"
starting full resync of recovery catalog
full resync complete

RMAN> sql "alter tablespace test_ts online";

sql statement: alter tablespace test_ts online
starting full resync of recovery catalog
full resync complete

-- check the past layout of the database

RMAN> report schema at time "to_date('26-MAR-2012 11:24:23','DD-MON-YYYY HH24:MI:SS')";

Report of database schema for database with db_unique_name ORA11PRD

List of Permanent Datafiles
===========================
File Size(MB) Tablespace RB segs Datafile Name
---- -------- -------------------- ------- ------------------------
1 700 SYSTEM YES C:\APP\WXYZ\ORADATA\ORA11PRD\SYSTEM01.DBF
2 600 SYSAUX YES C:\APP\WXYZ\ORADATA\ORA11PRD\SYSAUX01.DBF
3 300 UNDOTBS1 YES C:\APP\WXYZ\ORADATA\ORA11PRD\UNDOTBS01.DBF
4 32 USERS YES C:\APP\WXYZ\ORADATA\ORA11PRD\USERS01.DBF
5 100 TEST_TS YES C:\TEMP\TEST.DBF <--------------------------- new location of the file

List of Temporary Files
=======================
File Size(MB) Tablespace Maxsize(MB) Tempfile Name
---- -------- -------------------- ----------- --------------------
1 20 TEMP 32767 C:\APP\WXYZ\ORADATA\ORA11PRD\TEMP01.DBF



Regards,
Vaibhav

Hemant K Chitale said...

Narendra,
Vaibhav has provided demonstration.

Vaibhav,
Thank you !

NEERAJ VISHEN said...

Hi sir

As usual this another very good post . I have few doubt from the above post .Kindly explain..

1.) What is the information that Oracle stores in the controlfile(i.e, rman repository) related to backup .

From the above post , i assume something like that rman repository contains the the backup peice location and the datafile id not the location of the datafiles. It pickups the location from the datafile id values.

Please correct me ....

Neeraj

Hemant K Chitale said...

Neeraj,
The Backup and Recovery Reference documents the Recovery Catalog views (those beginning with RC_%).
However, the database Reference documents the V$ views (those beginning with V$BACKUP_%) that are views on information in the *control file*.
When you do a RESYNC CATALOG (and this is done automatically when Oracle detects structural changes to the database), Oracle copies information *from the controlfile to the RMAN catalog schema*. The controlfile for the database is still and always the *master*.

Hari Thanneru said...

nice xplantion.i have one doubt about rman configuration.i configured all rman setting in /rmanbkp location.but some backuppieces are stored in $ORACLE_HOME/dbs location.any idea

Hemant K Chitale said...

Hari,
Do a SHOW ALL in RMAN to document what you have configured. Generally, backup locations are configured via scripts with the FORMAT clause of the BACKUP command. Without that, the default location is DB_RECOVER_FILE_DEST (i.e. the FRA) or $ORACLE_HOME/dbs. Note that $ORACLE_HOME/dbs is the default location for a backupset for which you haven't specified a FORMAT.

Hemant

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