A nice feature of RMAN is the ability to duplicate, or clone, a database from a previous backup. It is possible to create a duplicate database on a remote server with the same file structure, a remote server will a different file structure or the local server with a different file structure. In this article I'll demonstrate how to duplicate a database on the local server .This can prove useful when we want to recover selected objects from a backup, rather than roll back a whole database or tablespace.
Purpose of Database Duplication : The goal of database duplication is the creation of a duplicate database, which is a separate database that contains all or a subset of the data in the source database. A duplicate database is useful for a variety of purposes, most of which involve testing. We can perform the following tasks in a duplicate database:
1.) Test backup and recovery procedures .
2.) Test an upgrade to a new release of Oracle Database .
3.) Test the effect of applications on database performance .4.) Generate reports .
5.) Export data such as a table that was inadvertently dropped from the production database, and then import it back into the production database
For example, we can duplicate the production database on host1 to host2, and then use the duplicate database on host2 to practice restoring and recovering this database while the production database on host1 operates as usual.
Terms used to describe the method step by step :
Target: Database to be cloned = "noida"
Duplicate or clone database = "clone"
Here the source and target database instances are on a Windows server.
1.) Prepare Init.ora file for the duplicate instance
Create the pfile from spfile of the target database as below :
SQL> select name,open_mode from v$database;
NAME OPEN_MODE
--------- ----------
NOIDA READ WRITE
SQL> create pfile='c:\noidainit.ora' from spfile;
File created.
Now edit the noidainit file.
a.) Replace "noida" with "clone"
b.) Add two below parameter as shown in clone parameter file.
DB_FILE_NAME_CONVERT
LOG_FILE_NAME_CONVERT
a.) Below is the pfile of target database (noida) :
noida.__db_cache_size=67108864
noida.__java_pool_size=12582912
noida.__large_pool_size=4194304
noida.__oracle_base='D:\oracle'#ORACLE_BASE set from environment
noida.__pga_aggregate_target=83886080
noida.__sga_target=234881024
noida.__shared_io_pool_size=0
noida.__shared_pool_size=130023424
noida.__streams_pool_size=4194304
*.audit_trail='db'
*.compatible='11.1.0.0.0'
*.control_files='D:\ORACLE\ORADATA\NOIDA\CONTROL01.CTL','D:\ORACLE\ORADATA\NOIDA\CONTROL02.CTL','D:\ORACLE\ORADATA\NOIDA\CONTROL03.CTL'#Restore Controlfile
*.db_block_size=8192
*.db_domain=''
*.db_name='noida'
*.db_recovery_file_dest='D:\oracle\flash_recovery_area'
*.db_recovery_file_dest_size=2147483648
*.diagnostic_dest='D:\oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=noidaXDB)'
*.log_archive_dest_1='LOCATION=D:\archive\'
*.log_archive_format='ARC%S_%R.%T'
*.memory_target=315621376
*.open_cursors=300
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.undo_tablespace='UNDOTBS1'
Now replace "noida" with "clone" and add two above parameter
clone.__db_cache_size=67108864
clone.__java_pool_size=12582912
clone.__large_pool_size=4194304
clone.__oracle_base='D:\oracle'#ORACLE_BASE set from environment
clone.__pga_aggregate_target=83886080
clone.__sga_target=234881024
clone.__shared_io_pool_size=0
clone.__shared_pool_size=130023424
clone.__streams_pool_size=4194304
*.audit_trail='db'
*.compatible='11.1.0.0.0'
*.control_files='D:\ORACLE\ORADATA\clone\CONTROL01.CTL','D:\ORACLE\ORADATA\clone\CONTROL02.CTL','D:\ORACLE\ORADATA\clone\CONTROL03.CTL'#Restore Controlfile
*.db_block_size=8192
*.db_domain=''
*.db_name='clone'
*.db_recovery_file_dest='D:\oracle\flash_recovery_area'
*.db_recovery_file_dest_size=2147483648
*.diagnostic_dest='D:\oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=cloneXDB)'
*.log_archive_dest_1='LOCATION=D:\archive\'
*.log_archive_format='ARC%S_%R.%T'
*.memory_target=315621376
*.open_cursors=300
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.undo_tablespace='UNDOTBS1'
db_file_name_convert=('D:\oracle\oradata\noida\','D:\oracle\oradata\clone\')
log_file_name_convert=('D:\oracle\oradata\noida\','D:\oracle\oradata\clone\')
Step 2 : If using linux Platform then create password file as below :
orapwd file=/u01/app/oracle/product/9.2.0.1.0/dbs/orapwDUP password=password entries=10
Step 3 : If using windows then Create Oracle related services (Required for Oracle on Windows only)
C:\> oradim -new -sid clone -intpwd clone -startmode m
Step 4 : Create directories for database files
Create the required directories on the target server for datafiles, redo logs, control files, temporary files etc, this example assumes that all the database files will be stored under ‘D:\oracle\oradata\clone' and 'D:\oracle\admin\clone\'
Step 5 : Configure listener and service name (i.e, tnsname.ora)
It is better to configure listener through net mgr or we can add the below details in listener.ora file
(SID_DESC =
(GLOBAL_DBNAME = clone)
(ORACLE_HOME = D:\oracle\product\11.1.0\db_1)
(SID_NAME = clone)
)
and perform following steps
C:\> lsnrctl
LSNRCTL> reload
or
LSNRCTL> stop
LSNRCTL> start
LSNRCTL> exit
Now add following entries in tnsnames.ora
CLONE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = xxxx)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = clone)
)
)
or we can also use netca command to configure the tns .
check tns entries as below :
C:\> tnsping clone
TNS Ping Utility for 32-bit Windows: Version 11.1.0.6.0 - Production on 22-APR-2011 11:33:04
Copyright (c) 1997, 2007, Oracle. All rights reserved.
Used parameter files:
D:\oracle\product\11.1.0\db_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = xxxx)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = clone)))
OK (30 msec)
Step 6 : Now Connect with Duplicate Database.
c:\> set ORACLE_SID=clone
c:\>sqlplus / as sysdba
SQL*Plus: Release 11.1.0.6.0 - Production on Fri Apr 22 10:44:14 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to an idle instance.
SQL> startup nomount pfile='C:\clone.ora';
ORACLE instance started.
Total System Global Area 318046208 bytes
Fixed Size 1332920 bytes
Variable Size 234883400 bytes
Database Buffers 75497472 bytes
Redo Buffers 6332416 bytes
SQL> create spfile from pfile='C:\clone.ora';
SQL>shut immediate
ORA-01507: database not mounted
ORACLE instance shut down.
SQL> startup nomount
ORACLE instance started.
Total System Global Area 318046208 bytes
Fixed Size 1332920 bytes
Variable Size 234883400 bytes
Database Buffers 75497472 bytes
Redo Buffers 6332416 bytes
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Step 7 : Now Duplicate the Target Database .
C:\>rman target sys/ramtech@noida auxiliary sys/clone@clone
Recovery Manager: Release 11.1.0.6.0 - Production on Fri Apr 22 11:16:38 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: NOIDA (DBID=1502483083)
connected to auxiliary database: CLONE (not mounted)
RMAN> duplicate target database to "clone" nofilenamecheck;
Starting Duplicate Db at 22-APR-11
using target database control file instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=170 device type=DISK
contents of Memory Script:
{
set until scn 1955915;
set newname for datafile 1 to
"D:\ORACLE\ORADATA\CLONE\SYSTEM01.DBF";
set newname for datafile 2 to
"D:\ORACLE\ORADATA\CLONE\SYSAUX01.DBF";
set newname for datafile 3 to
"D:\ORACLE\ORADATA\CLONE\UNDOTBS01.DBF";
set newname for datafile 4 to
"D:\ORACLE\ORADATA\CLONE\USERS01.DBF";
set newname for datafile 5 to
"D:\ORACLE\ORADATA\CLONE\EXAMPLE01.DBF";
set newname for datafile 6 to
"D:\ORACLE\ORADATA\CLONE\TRANS.DBF";
restore
clone database
;
}
executing Memory Script
executing command: SET until clause
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting restore at 22-APR-11
using channel ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00001 to D:\ORACLE\ORADATA\CLONE\SYSTEM01.DBF
channel ORA_AUX_DISK_1: restoring datafile 00002 to D:\ORACLE\ORADATA\CLONE\SYSAUX01.DBF
channel ORA_AUX_DISK_1: restoring datafile 00003 to D:\ORACLE\ORADATA\CLONE\UNDOTBS01.DBF
channel ORA_AUX_DISK_1: restoring datafile 00004 to D:\ORACLE\ORADATA\CLONE\USERS01.DBF
channel ORA_AUX_DISK_1: restoring datafile 00005 to D:\ORACLE\ORADATA\CLONE\EXAMPLE01.DBF
channel ORA_AUX_DISK_1: restoring datafile 00006 to D:\ORACLE\ORADATA\CLONE\TRANS.DBF
channel ORA_AUX_DISK_1: reading from backup piece D:\ORACLE\FLASH_RECOVERY_AREA\NOIDA\BACKUPSET\2011_04_21\O1_MF_NNNDF_TAG20110421T134444_6TZSWBRW_.BKP
channel ORA_AUX_DISK_1: piece handle=D:\ORACLE\FLASH_RECOVERY_AREA\NOIDA\BACKUPSET\2011_04_21\O1_MF_NNNDF_TAG20110421T134444_6TZSWBRW_.BKP tag=TAG20110421T134444
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:03:35
Finished restore at 22-APR-11
sql statement: CREATE CONTROLFILE REUSE SET DATABASE "CLONE" RESETLOGS ARCHIVELOG
MAXLOGFILES 37
MAXLOGMEMBERS 3
MAXDATAFILES 10
MAXINSTANCES 1
MAXLOGHISTORY 292
LOGFILE
GROUP 1 ( 'D:\ORACLE\ORADATA\CLONE\REDO01.LOG' ) SIZE 50 M REUSE,
GROUP 2 ( 'D:\ORACLE\ORADATA\CLONE\REDO02.LOG' ) SIZE 50 M REUSE,
GROUP 3 ( 'D:\ORACLE\ORADATA\CLONE\REDO03.LOG' ) SIZE 50 M REUSE
DATAFILE
'D:\ORACLE\ORADATA\CLONE\SYSTEM01.DBF'
CHARACTER SET WE8MSWIN1252
contents of Memory Script:
{
switch clone datafile all;
}
executing Memory Script
datafile 2 switched to datafile copy
input datafile copy RECID=1 STAMP=749128842 file name=D:\ORACLE\ORADATA\CLONE\SYSAUX01.DBF
datafile 3 switched to datafile copy
input datafile copy RECID=2 STAMP=749128842 file name=D:\ORACLE\ORADATA\CLONE\UNDOTBS01.DBF
datafile 4 switched to datafile copy
input datafile copy RECID=3 STAMP=749128843 file name=D:\ORACLE\ORADATA\CLONE\USERS01.DBF
datafile 5 switched to datafile copy
input datafile copy RECID=4 STAMP=749128843 file name=D:\ORACLE\ORADATA\CLONE\EXAMPLE01.DBF
datafile 6 switched to datafile copy
input datafile copy RECID=5 STAMP=749128843 file name=D:\ORACLE\ORADATA\CLONE\TRANS.DBF
contents of Memory Script:
{
set until scn 1955915;
recover
clone database
delete archivelog
;
}
executing Memory Script
executing command: SET until clause
Starting recover at 22-APR-11
using channel ORA_AUX_DISK_1
starting media recovery
archived log for thread 1 with sequence 47 is already on disk as file D:\ARCHIVE\ARC00047_0748802215.001
archived log for thread 1 with sequence 48 is already on disk as file D:\ARCHIVE\ARC00048_0748802215.001
archived log for thread 1 with sequence 49 is already on disk as file D:\ARCHIVE\ARC00049_0748802215.001
archived log for thread 1 with sequence 50 is already on disk as file D:\ARCHIVE\ARC00050_0748802215.001
archived log for thread 1 with sequence 51 is already on disk as file D:\ARCHIVE\ARC00051_0748802215.001
archived log for thread 1 with sequence 52 is already on disk as file D:\ARCHIVE\ARC00052_0748802215.001
archived log for thread 1 with sequence 53 is already on disk as file D:\ARCHIVE\ARC00053_0748802215.001
archived log for thread 1 with sequence 54 is already on disk as file D:\ARCHIVE\ARC00054_0748802215.001
archived log for thread 1 with sequence 55 is already on disk as file D:\ARCHIVE\ARC00055_0748802215.001
archived log for thread 1 with sequence 56 is already on disk as file D:\ARCHIVE\ARC00056_0748802215.001
archived log for thread 1 with sequence 57 is already on disk as file D:\ARCHIVE\ARC00057_0748802215.001
archived log for thread 1 with sequence 58 is already on disk as file D:\ARCHIVE\ARC00058_0748802215.001
archived log for thread 1 with sequence 59 is already on disk as file D:\ARCHIVE\ARC00059_0748802215.001
archived log file name=D:\ARCHIVE\ARC00047_0748802215.001 thread=1 sequence=47
archived log file name=D:\ARCHIVE\ARC00048_0748802215.001 thread=1 sequence=48
archived log file name=D:\ARCHIVE\ARC00049_0748802215.001 thread=1 sequence=49
archived log file name=D:\ARCHIVE\ARC00050_0748802215.001 thread=1 sequence=50
archived log file name=D:\ARCHIVE\ARC00051_0748802215.001 thread=1 sequence=51
archived log file name=D:\ARCHIVE\ARC00052_0748802215.001 thread=1 sequence=52
archived log file name=D:\ARCHIVE\ARC00053_0748802215.001 thread=1 sequence=53
archived log file name=D:\ARCHIVE\ARC00054_0748802215.001 thread=1 sequence=54
archived log file name=D:\ARCHIVE\ARC00055_0748802215.001 thread=1 sequence=55
archived log file name=D:\ARCHIVE\ARC00056_0748802215.001 thread=1 sequence=56
archived log file name=D:\ARCHIVE\ARC00057_0748802215.001 thread=1 sequence=57
archived log file name=D:\ARCHIVE\ARC00058_0748802215.001 thread=1 sequence=58
archived log file name=D:\ARCHIVE\ARC00059_0748802215.001 thread=1 sequence=59
media recovery complete, elapsed time: 00:01:35
Finished recover at 22-APR-11
contents of Memory Script:
{
shutdown clone immediate;
startup clone nomount ;
}
executing Memory Script
database dismounted
Oracle instance shut down
connected to auxiliary database (not started)
Oracle instance started
Total System Global Area 318046208 bytes
Fixed Size 1332920 bytes
Variable Size 234883400 bytes
Database Buffers 75497472 bytes
Redo Buffers 6332416 bytes
sql statement: CREATE CONTROLFILE REUSE SET DATABASE "CLONE" RESETLOGS ARCHIVELOG
MAXLOGFILES 37
MAXLOGMEMBERS 3
MAXDATAFILES 10
MAXINSTANCES 1
MAXLOGHISTORY 292
LOGFILE
GROUP 1 ( 'D:\ORACLE\ORADATA\CLONE\REDO01.LOG' ) SIZE 50 M REUSE,
GROUP 2 ( 'D:\ORACLE\ORADATA\CLONE\REDO02.LOG' ) SIZE 50 M REUSE,
GROUP 3 ( 'D:\ORACLE\ORADATA\CLONE\REDO03.LOG' ) SIZE 50 M REUSE
DATAFILE
'D:\ORACLE\ORADATA\CLONE\SYSTEM01.DBF'
CHARACTER SET WE8MSWIN1252
contents of Memory Script:
{
set newname for tempfile 1 to
"D:\ORACLE\ORADATA\CLONE\TEMP02.DBF";
switch clone tempfile all;
catalog clone datafilecopy "D:\ORACLE\ORADATA\CLONE\SYSAUX01.DBF";
catalog clone datafilecopy "D:\ORACLE\ORADATA\CLONE\UNDOTBS01.DBF";
catalog clone datafilecopy "D:\ORACLE\ORADATA\CLONE\USERS01.DBF";
catalog clone datafilecopy "D:\ORACLE\ORADATA\CLONE\EXAMPLE01.DBF";
catalog clone datafilecopy "D:\ORACLE\ORADATA\CLONE\TRANS.DBF";
switch clone datafile all;
}
executing Memory Script
executing command: SET NEWNAME
renamed tempfile 1 to D:\ORACLE\ORADATA\CLONE\TEMP02.DBF in control file
cataloged datafile copy
datafile copy file name=D:\ORACLE\ORADATA\CLONE\SYSAUX01.DBF RECID=1 STAMP=749128969
cataloged datafile copy
datafile copy file name=D:\ORACLE\ORADATA\CLONE\UNDOTBS01.DBF RECID=2 STAMP=749128970
cataloged datafile copy
datafile copy file name=D:\ORACLE\ORADATA\CLONE\USERS01.DBF RECID=3 STAMP=749128970
cataloged datafile copy
datafile copy file name=D:\ORACLE\ORADATA\CLONE\EXAMPLE01.DBF RECID=4 STAMP=749128970
cataloged datafile copy
datafile copy file name=D:\ORACLE\ORADATA\CLONE\TRANS.DBF RECID=5 STAMP=749128971
datafile 2 switched to datafile copy
input datafile copy RECID=1 STAMP=749128969 file name=D:\ORACLE\ORADATA\CLONE\SYSAUX01.DBF
datafile 3 switched to datafile copy
input datafile copy RECID=2 STAMP=749128970 file name=D:\ORACLE\ORADATA\CLONE\UNDOTBS01.DBF
datafile 4 switched to datafile copy
input datafile copy RECID=3 STAMP=749128970 file name=D:\ORACLE\ORADATA\CLONE\USERS01.DBF
datafile 5 switched to datafile copy
input datafile copy RECID=4 STAMP=749128970 file name=D:\ORACLE\ORADATA\CLONE\EXAMPLE01.DBF
datafile 6 switched to datafile copy
input datafile copy RECID=5 STAMP=749128971 file name=D:\ORACLE\ORADATA\CLONE\TRANS.DBF
contents of Memory Script:
{
Alter clone database open resetlogs;
}
executing Memory Script
database opened
Finished Duplicate Db at 22-APR-11
RMAN> exit
Recovery Manager complete.
Step 8 : Check the Duplicate "clone" Database .
C:\>sqlplus sys/clone@clone as sysdba
SQL*Plus: Release 11.1.0.6.0 - Production on Fri Apr 22 11:43:05 2011
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select name,open_mode from v$database;
NAME OPEN_MODE
--------- ----------
CLONE READ WRITE
Enjoy J J J
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