Database Recovery #6 - Duplication/Cloning from RMAN backup

The steps below show how to perform a BACKUP BASED database duplication (not an active

duplication) The TARGET database is the source database you draw the backup pieces from, the AUXILIARY database is where you will restore to and recover up until.

A backup must be available and must be accessible from the auxiliary database via Oracle .Net
The server on which RMAN is being operated MUST have access the backup pieces. If the AUXILIARY db is going to reside on a different machine, the machine must have the backup location mapped from the machine on which the TARGET resides.

This guide was used with a TARGET instance in archivelog mode.
Its not necessary to have both instance using the same app tree but the TARGET and AUXILIARY must share the exact same application tree setup (versions, patches).
Compare with both trees using $ORACLE_HOME/OPatch/opatch lsinventory


--First backup the target database
. oraenv 
orcl
rman target=/
backup database plus archivelog delete input;


--Pick a time, SCN or archivelog number to duplicate AUXILIARY database up until. Do this by looking 
--at the catalog of your TARGET DATABASE to determine what is possible.
list backup;
list archivelog all;


--You want to make sure the TIME,SCN or SEQ you pick coincides with the backed up archivelogs you have available in the TARGET instance. RMAN will tell you flat out if you
--pick a value which is not possible to recover to.
--In the guide below, I took a backup a few hours earlier and backed up archivelog instead.


--PREPARE THE AUXILIARY DATABASE environemnt.
--Add new database to /etc/oratab : I use the SID - DUP
vi /etc/oratab
dup:/u01/app/oracle/product/11.1.0/db_1


--Add the new database to the listener.ora file
SID_LIST_LISTENER=
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = orcl)
      (ORACLE_HOME = /u01/app/oracle/product/11.1.0/db_1)
      (SID_NAME = orcl)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = dup)
      (ORACLE_HOME = /u01/app/oracle/product/11.1.0/db_1)
      (SID_NAME = dup)
    )
  )


--Add the new database to the tnsnames.ora file
DUP =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
    (CONNECT_DATA =
      (SID = dup)
      (SERVER = DEDICATED)
    )
  )

--Give the AUXILIARY db an init.ora file by duplication the target database init file and changing the values.
--Change the control_files parameter
--Change the core_dump_dest name
--Change the db_name
--Change the dispatchers name
--Add the convert file name parameters 
--Change the log_archive_dest_1 location
----DB_FILE_NAME_CONVERT
----LOG_FILE_NAME_CONVERT


[oracle@vmorcl ~]$ cp $ORACLE_HOME/dbs/initorcl.ora $ORACLE_HOME/dbs/initdup.ora
[oracle@vmorcl ~]$ vi $ORACLE_HOME/dbs/initdup.ora
*.audit_file_dest='/u01/app/oracle/admin/dup/adump'
*.audit_trail='DB'
*.compatible='11.2.0'
*.control_files='/u01/app/oracle/oradata/dup/control01.ctl','/u01/app/oracle/oradata/dup/control02.ctl'
*.core_dump_dest='/u01/app/oracle/admin/dup/cdump'
*.db_block_size=8192
*.db_cache_size=128M
*.db_domain='localdomain'
*.DB_FILE_NAME_CONVERT='/u01/app/oracle/oradata/orcl/','/u01/app/oracle/oradata/dup/'
*.db_name='dup'
*.LOG_FILE_NAME_CONVERT='/u01/app/oracle/oradata/orcl/','/u01/app/oracle/oradata/dup/'
*.db_recovery_file_dest='/u01/app/oracle/flash_recovery_area'
*.db_recovery_file_dest_size=10000000000
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=dupXDB)'
*.log_archive_dest_1='LOCATION=/redologs/stage2'
*.log_buffer=10485760
*.memory_max_target=512M
*.memory_target=512M
*.open_cursors=300
*.optimizer_dynamic_sampling=2
*.optimizer_mode='ALL_ROWS'
*.plsql_warnings='DISABLE:ALL'
*.processes=150
*.query_rewrite_enabled='TRUE'
*.recyclebin='OFF'
*.remote_login_passwordfile='EXCLUSIVE'
*.result_cache_max_size=2304K
*.sga_max_size=372M# internally adjusted
*.sga_target=372M
*.skip_unusable_indexes=TRUE
*.undo_tablespace='UNDOTS'


--Create the datafile folders
mkdir /u01/app/oracle/oradata/dup/


--Create the diagnostic folders
mkdir /u01/app/oracle/admin/dup/dup
mkdir /u01/app/oracle/admin/dup/adump
mkdir /u01/app/oracle/admin/dup/bdump
mkdir /u01/app/oracle/admin/dup/cdump


--Reload the listener.
lsnrctl reload


--Duplicate password file
cp /u01/app/oracle/product/11.1.0/db_1/dbs/orapworcl /u01/app/oracle/product/11.1.0/db_1/dbs/orapwdup



--Startup the duplicate database with nomount
. oraenv
dup
sqlplus /nolog
conn / as sysdba
startup nomount pfile='$ORACLE_HOME/dbs/initdup.ora';
exit;


--Connect to the target and auxiliary databases
rman target=sys/oracle@orcl auxiliary=sys/oracle@dup


--Duplicate the database
--You must have a full backup (cold or warm), and you must specify an until sequence,time or scn. 
--Below I use up until past the last sequence number in the archivelog backup
run {
  DUPLICATE TARGET DATABASE TO dup;
  SET UNTIL SEQUENCE 1;
}


--Provided all went well, your instance should be up and running.