Friday 21 May 2010

Cloning a RAC Database

Cloning a RAC Database may appear somewhat challenging, but its actually cloning a database as if it was a single instance and then enabling it as a cluster post to the duplication.
In the below scenario, I will demonstrate how this can be achieved by cloning a RAC database and have it manage by the same cluster. Please note that the following was tested for version 11.1 RAC with ASM.
The RAC configuration used for this example:

Configuration Source Target (Auxiliary)
Hostlnx01lnx02
Host VIPslnx01-viplnx02-vip
DB NameSALTPEPPER
Instance Name #1SALT1PEPPER1
Instance Name #2SALT2PEPPER2
Control File Location+DG_DATA,+DG_REDO+DG_DATA,+DG_REDO
Redo File Location+DG_DATA,+DG_REDO+DG_DATA,+DG_REDO
Data File Location+DG_DATA+DG_DATA
Archive Destination Location+DG_ARC+DG_ARC
Remote ListenerLISTENER_SALTLISTENER_PEPPER
Local Listener #1LISTENER_SALT1LISTENER_PEPPER1
Local Listener #1LISTENER_SALT2LISTENER_PEPPER2
NOTE*:  Control file and online redo log copies, archived redo log files can be stored in the Flash Recovery Area (FRA) Disk Group.
1. Log onto source RAC database:
[oracle@lnx01] export ORACLE_SID=SALT1; . oraenv
[oracle@lnx01] sqlplus / as sysdba
SQL> create pfile='/app/oracle/scripts/clone/initPEPPER.ora';
2. Edit /tmp/initPEPPER.ora and change the appropriate values.
Remove the following entries:
<SOURCE_INSTANCE1>.__db_cache_size=7650410496
<SOURCE_INSTANCE2>.__db_cache_size=7583301632
<SOURCE_INSTANCE1>.__java_pool_size=67108864
<SOURCE_INSTANCE2>.__java_pool_size=67108864
<SOURCE_INSTANCE1>.__large_pool_size=67108864
<SOURCE_INSTANCE2>.__large_pool_size=67108864
<SOURCE_INSTANCE1>.__oracle_base='/app/oracle'
<SOURCE_INSTANCE2>.__oracle_base='/app/oracle'
<SOURCE_INSTANCE1>.__pga_aggregate_target=6643777536
<SOURCE_INSTANCE2>.__pga_aggregate_target=6643777536
<SOURCE_INSTANCE1>.__sga_target=9462349824
<SOURCE_INSTANCE2>.__sga_target=9462349824
<SOURCE_INSTANCE1>.__shared_io_pool_size=0
<SOURCE_INSTANCE2>.__shared_io_pool_size=0
<SOURCE_INSTANCE1>.__shared_pool_size=1409286144
<SOURCE_INSTANCE2>.__shared_pool_size=1476395008
<SOURCE_INSTANCE1>.__streams_pool_size=134217728
<SOURCE_INSTANCE2>.__streams_pool_size=134217728
3. Adjust Memory Target accordingly for your environment
*.memory_target=2G
4. Set spfile parameter:
*.spfile='+DG_DATA/PEPPER/spfilePEPPER.ora'
5. Disable the cluster_database parameter:
*.cluster_database=FALSE
6. Create init parameter under dbs:
[oracle@lnx01] export ORACLE_HOME=/app/oracle/product/11.1
[oracle@lnx01] cd $ORACLE_HOME/dbs
[oracle@lnx01] echo "SPFILE='+DG_DATA/PEPPER/spfilePEPPER.ora'" > $ORACLE_HOME/dbs/initPEPPER.ora
7. Edit initPEPPER.ora and add the following convert parameters:
*.log_file_name_convert=('+DG_DATA/SALT','+DG_DATA/PEPPER')
*.db_file_name_convert=('+DG_DATA/SALT','+DG_DATA/PEPPER')
8. Create the directories:
a) From one node only, create the ASM path for PEPPER database:
[oracle@lnx01] export ORACLE_SID=+ASM1; . oraenv
[oracle@lnx01] asmcmd mkdir +DG_DATA/PEPPER
[oracle@lnx01] asmcmd mkdir +DG_DATA/PEPPER/brsadata
b) From one node only, create the OS path for PEPPER admin directories:
[oracle@lnx01] mkdir -p /app/oracle/admin/PEPPER/adump
[oracle@lnx01] mkdir -p /app/oracle/diag/rdbms/PEPPER/PEPPER1/cdump
[oracle@lnx01] mkdir -p /app/oracle/diag/rdbms/PEPPER/PEPPER1/trace
c) Repeat step b on node 2 and other nodes in RAC:
[oracle@lnx02] mkdir -p /app/oracle/admin/PEPPER/adump
[oracle@lnx02] mkdir -p /app/oracle/diag/rdbms/PEPPER/PEPPER2/cdump
[oracle@lnx02] mkdir -p /app/oracle/diag/rdbms/PEPPER/PEPPER2/trace
9. Create a TNS entry for target auxiliary database and place in the tnsnames.ora. Add these entries on all nodes in cluster:
PEPPER =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx01-vip)(PORT = 1521))
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx02-vip)(PORT = 1521))
 (CONNECT_DATA =
 (SERVICE_NAME = PEPPER)
 )
 )

LISTENERS_PEPPER =
 (ADDRESS_LIST =
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx01-vip)(PORT = 1521))
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx02-vip)(PORT = 1521))
 )

LISTENER_PEPPER1 =
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx01-vip)(PORT = 1521))

LISTENER_PEPPER2 =
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx02-vip)(PORT = 1521))
10. If no listener.ora exists, create one as follows
# Node 1
 LISTENER_lnx01 =
 (DESCRIPTION_LIST =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx01-vip)(PORT = 1521)(IP = FIRST))
 (ADDRESS = (PROTOCOL = TCP)(HOST = 207.23.2.122)(PORT = 1521)(IP = FIRST))
 )
 )
# Node 2
 LISTENER_lnx02 =
 (DESCRIPTION_LIST =
 (DESCRIPTION =
 (ADDRESS = (PROTOCOL = TCP)(HOST = lnx02-vip)(PORT = 1521)(IP = FIRST))
 (ADDRESS = (PROTOCOL = TCP)(HOST = 207.23.2.126)(PORT = 1521)(IP = FIRST))
 )
 )
11. Create an SPFILE from the parameter file, and start the auxiliary instance:
[oracle@lnx01] export ORACLE_HOME=/app/oracle/product/11.1
[oracle@lnx01] export ORACLE_SID=PEPPER
SQL> CONNECT / as sysdba
SQL> CREATE SPFILE='+DG_DATA/PEPPER/spfilePEPPER.ora'
FROM PFILE='/app/oracle/scripts/clone/initPEPPER.ora';
SQL> STARTUP NOMOUNT;
12. Then run the following RMAN commands to duplicate the database:
[oracle@lnx01] rman target sysdba/<password>@SALT auxiliary /
RMAN> DUPLICATE TARGET DATABASE TO 'PEPPER';
14. Add the entry for oratab file (located under /etc or /var/opt/oracle) for target auxiliary db:
a) Add in For node 1 oratab file:
PEPPER1:/app/oracle/product/11.1:N
b) Add in For node 2 oratab file:
PEPPER2:/app/oracle/product/11.1:N
15. Enable the cluster parameter in the target auxiliary database from one node only
[oracle@lnx01] export ORACLE_HOME=/app/oracle/product/11.1
[oracle@lnx01] export ORACLE_SID=PEPPER
[oracle@lnx01] sqlplus / as sysdba
SQL> alter system set cluster_database=TRUE scope=spfile;
SQL> shutdown immediate;
16. Rename the init file and then copy the init file across to the
[oracle@lnx01] export ORACLE_SID=PEPPER1; . oraenv
[oracle@lnx01] mv $ORACLE_HOME/dbs/initPEPPER.ora $ORACLE_HOME/dbs/initPEPPER1.ora
[oracle@lnx01] scp $ORACLE_HOME/dbs/initPEPPER1.ora \
lnx02:/app/oracle/product/11.1/dbs/initPEPPER2.ora
17. Add the second thread of online redo logs and enable that thread;
SQL> startup
18. Start up the second instance:
SQL> ALTER DATABASE ADD LOGFILE THREAD 2 GROUP 5 '+DG_DATA' SIZE 250M reuse;
SQL> ALTER DATABASE ADD LOGFILE MEMBER '+DG_REDO' TO GROUP 5 ;
SQL> ALTER DATABASE ADD LOGFILE THREAD 2 GROUP 6  '+DG_REDO' SIZE 250M reuse;
SQL> ALTER DATABASE ADD LOGFILE MEMBER '+DG_DATA' TO GROUP 6;
SQL> ALTER DATABASE ADD LOGFILE THREAD 2 GROUP 7 '+DG_REDO' SIZE 250M reuse;
SQL> ALTER DATABASE ADD LOGFILE MEMBER '+DG_DATA' TO GROUP 7;
SQL> ALTER DATABASE ADD LOGFILE THREAD 2 GROUP 8 '+DG_REDO' SIZE 250M reuse;
SQL> ALTER DATABASE ADD LOGFILE MEMBER '+DG_DATA' TO GROUP 8;
SQL> ALTER DATABASE ENABLE PUBLIC THREAD 2;
19. Stop all instances on each node for the target auxiliary database
a) From node 1 perform the following:
[oracle@lnx01] export ORACLE_SID=PEPPER1; . oraenv
[oracle@lnx01] sqlplus / as sysdba
SQL> shutdown immediate;
b) Then perform for other instances in the cluster:
[oracle@lnx01] export ORACLE_SID=PEPPER2; . oraenv
[oracle@lnx01] sqlplus / as sysdba
SQL> shutdown immediate;
20. To add into the cluster, add the new database to srvctl:
[oracle@lnx01] srvctl add database -d PEPPER -o /app/oracle/product/11.1
[oracle@lnx01] srvctl modify database -d PEPPER -p '+DG_DATA/PEPPER/spfilePEPPER.ora' -s open
[oracle@lnx01] srvctl add instance -d PEPPER -i PEPPER1 -n lnx01
[oracle@lnx01] srvctl add instance -d PEPPER -i PEPPER2 -n lnx02
20. Start the RAC database
[oracle@lnx01] srvctl start database -d PEPPER
21. Now verify that the RAC database has now registered with the cluster.
For pre-11.2 run:
crs_stat –t
Or for 11.2 run:
crsctl stat res -t
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