• Arun Kumar

RMAN Duplicate Database PITR

RMAN active database duplication will perform database cloning from live database. It does not use RMAN backups to clone database. With RMAN duplicate command, you can use a previously taken backup and perform a Point-in-time clone on a target server.


Prerequisites


Before you begin with this activity, make sure below items are addressed

  • Source database is running in Archive log mode

  • Check for space requirements on target server

  • Servers are able to ping each other



RMAN Duplicate PITR with Same SID


In this section we will be duplicating database using RMAN where the source and target SID will be same. Our source SID is prod and the clone database SID will also be prod. Also note, the database file locations on target server will be same as our source server.


I would like to perform a PITR clone (time 07:00 am) of prod database using the backup taken at 06:52 am.


Configure Listener on clone server to accept incoming connections

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = clone.dbagenesis.com)(PORT = 1521))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (ORACLE_HOME = /u01/app/oracle/product/12.2.0/db_home)
      (SID_NAME = prod)
    )
  )

Start the listener on the clone server

lsnrctl start listener

Configure tns entries on the prod server to connect clone server

prod_clone =
 (DESCRIPTION = 
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(HOST = clone.dbagenesis.com)(PORT = 1521))
   )
 (CONNECT_DATA =
   (SERVICE_NAME = prod)
 )
)

Make sure to test the tnsping is working from prod to clone server

tnsping prod_clone

On prod server, create pfile from spfile and copy to clone server

create pfile from spfile;

cd $ORACLE_HOME/dbs
scp initprod.ora oracle@clone.dbagenesis.com:$ORACLE_HOME/dbs

Also copy the password file from prod to clone server

scp orapwprod oracle@clone.dbagenesis.com:$ORACLE_HOME/dbs

If no password file exists, create one via the below command and then copy

orapwd file=$ORACLE_HOME/dbs/orapwprod force=y

On the clone server, open the pfile that you copied from prod server and create directory locations

cat $ORACLE_HOME/dbs/initprod.ora

In my case I had to create below two main locations

mkdir -p <control_file_locations>
mkdir -p <adump_locations>

For PITR cloning, we will search for the backup which was taken before PITR time and then find the locations of the backup pieces.

rman duplicate database pitr - rman list backup summary

In my case, above backup is taken at 06:52 which is before the target PITR 07:00 am. I will be using above particular backups to perform the cloning. Let us check each backup tag and copy the backup pieces to clone server under same location as source.


We will start with first backup tag

rman duplicate database pitr - rman list backup tag

Create the same backup pieces location on clone server as you see under Piece Name

mkdir -p /u01/FRA/PROD/backupset/2021_01_24

Copy the backup pieces from source to clone server

scp /u01/FRA/PROD/backupset/2021_01_24/o1_mf_annnn_TAG20210124T065238_j0t69pdz_.bkp oracle@clone.dbagenesis.com:/u01/FRA/PROD/backupset/2021_01_24/
o1_mf_annnn_TAG20210124T065238_j0t69pdz_.bkp

Lets check the second backup tag details

rman duplicate database pitr - rman list second backup tag

We already have created the backup piece location on clone server in the previous step, just copy the backup piece to target server

scp /u01/FRA/PROD/backupset/2021_01_24/o1_mf_nnndf_TAG20210124T065239_j0t69qrh_.bkp oracle@clone.dbagenesis.com:/u01/FRA/PROD/backupset/2021_01_24/o1_mf_nnndf_TAG20210124T065239_j0t69qrh_.bkp

Lets check the third backup tag

rman duplicate database pitr - rman list third backup tag

We already have created the backup piece location on clone server, just copy the backup piece to target server

scp /u01/FRA/PROD/backupset/2021_01_24/o1_mf_annnn_TAG20210124T065242_j0t69tyh_.bkp oracle@clone.dbagenesis.com:/u01/FRA/PROD/backupset/2021_01_24/o1_mf_annnn_TAG20210124T065242_j0t69tyh_.bkp

Lets check the fourth backup tag

rman duplicate database pitr - rman list fourth backup tag

Create the same backup pieces location on clone server as you see under Piece Name

mkdir -p /u01/FRA/PROD/autobackup/2021_01_24

Copy the backup piece from source to clone server

scp /u01/FRA/PROD/autobackup/2021_01_24/o1_mf_s_1062658364_j0t69w43_.bkp oracle@clone.dbagenesis.com:/u01/FRA/PROD/autobackup/2021_01_24/o1_mf_s_1062658364_j0t69w43_.bkp

Find all the archivelogs needed for recovery by searching for archivelogs generated after backup was triggered and till PITR and copy to clone server

set lines 999;
col name for a60;
select first_time, next_time, name from v$archived_log;

Take the clone database to nomount mode

export ORACLE_SID=prod
sqlplus / as sysdba
startup nomount;
exit;

Start RMAN at source and perform PITR cloning

rman target sys auxiliary sys@prod_clone

--> give same sys password for both target and auxiliary

duplicate target database to 'prod' until time 
"TO_DATE('2021-01-24 07:00:00', 'YYYY-MM-DD HH24:MI:SS')" nofilenamecheck;


RMAN Duplicate PITR with different SID


To perform PITR to a different SID with different file locations, there are few more added steps. In this section, we will be cloning prod database to clone SID.


Configure Listener on clone server to accept incoming connections

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = clone.dbagenesis.com)(PORT = 1521))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (ORACLE_HOME = /u01/app/oracle/product/12.2.0/db_home)
      (SID_NAME = clone)
    )
  )

Start the listener

lsnrctl start listener

Configure tns entries on the prod server

clone =
 (DESCRIPTION = 
   (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(HOST = clone.dbagenesis.com)(PORT = 1521))
   )
 (CONNECT_DATA =
   (SERVICE_NAME = clone)
 )
)

Make sure to test the tnsping is working from prod to clone server

tnsping clone

On prod server, create pfile from spfile and copy to clone server

SQL> create pfile from spfile;

cd $ORACLE_HOME/dbs
scp initprod.ora oracle@clone.dbagenesis.com:$ORACLE_HOME/dbs/initclone.ora

Also, copy the password file from prod to clone server

scp orapwprod oracle@clone.dbagenesis.com:$ORACLE_HOME/dbs/orapwclone

If no password file exists, create one via the below command and then copy

orapwd file=$ORACLE_HOME/dbs/orapwclone force=y

On the clone server, open the pfile that you copied from prod server. Replace prod with clone SID

vi $ORACLE_HOME/dbs/initclone.ora

:%s/prod/clone      --> replace prod with clone

Add below two parameters to change data files and log files locations while cloning the database

*.db_file_name_convert='/u01/app/oracle/oradata/PROD','/u01/app/oracle/oradata/clone'
	*.log_file_name_convert='/u01/app/oracle/oradata/PROD','/u01/app/oracle/oradata/clone'

Save the pfile & exit. Create respective directories from the clone pfile. In my case, I had to create below directories

mkdir -p <control_file_locations>	
mkdir -p <adump_locations>
mkdir -p <df_file_name_convert_location>
mkdir -p <log_file_name_convert_location>

Make the backup files from the source database available to the destination server

cd /u01/app/oracle/fast_recovery_area/PROD/

scp -r archivelog oracle@clone.dbagenesis.com:/u01/app/oracle/fast_recovery_area/PROD/	

scp -r autobackup oracle@clone.dbagenesis.com:/u01/app/oracle/fast_recovery_area/PROD/
	
scp -r backupset oracle@clone.dbagenesis.com:/u01/app/oracle/fast_recovery_area/PROD/

Take the clone server database to nomount stage

export ORACLE_SID=clone
sqlplus / as sysdba
startup nomount;
exit;

Start RMAN at source and connect to clone database

rman target sys auxiliary sys@clone

--> give same sys password for both target and auxiliary

Duplicate target database to "clone" until time 
"TO_DATE('2021-01-07 14:27:17', 'YYYY-MM-DD HH24:MI:SS')" nofilenamecheck;


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