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Saturday, January 2, 2016

Convert a single instance 12c non container database to a RAC database - Manual method

This would be my first post of 2016. Hope I do post more to contribute in the Oracle community!
We will see how to convert a single instance Oracle 12c database to a RAC database by following the procedure below.
We have a single instance database running on a server where cluster software is already installed and configured.
You can use this link to create a single instance (stand alone) 12c database. Change the compatible value to 12.1.0.0.0 and check the relavent path settings. If you are using ASM, then use the ASM path in CREATE DATABASE command accordingly.
If you would like the database to be container database i.e if you want to plug other databases to this main database, then use the below parameter in the parameter file
enable_pluggable_database=true

The existing setup is as follows.
Oracle database version: 12.1.0.1.0
Oracle clusterware version: 12.1.0.1.0
ASM version: 12.1.0.1.0
Non-RAC DB & instance name: NONPLUG
Servers in cluster: 12r1-rac1.selvapc.com (12r1-rac1) & 12r1-rac2.selvapc.com (12r1-rac2)

Step 1: Environment Check
I have a database which is a single instance non container 12c database and the properties are as below.
SQL> select name, instance_name from v$database, v$instance;

NAME      INSTANCE_NAME
--------- ----------------
NONPLUG   nonplug

SQL> sho parameter enable_pluggable

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
enable_pluggable_database            boolean     FALSE
SQL> sho parameter cluster

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
cluster_database                     boolean     FALSE
cluster_database_instances           integer     1
cluster_interconnects                string

Check that we have the ASM software of version equal or higher then the RDBMS that we are converting.
Here in our case we are good.
SQL> select software_version from v$asm_client;

SOFTWARE_VERSION
------------------------------------------------------------
12.1.0.1.0

This shows the clusterware version on both the nodes involved.
[oracle@12r1-rac1 ~]$ crsctl query crs softwareversion 12r1-rac1
Oracle Clusterware version on node [12r1-rac1] is [12.1.0.1.0]
[oracle@12r1-rac1 ~]$ crsctl query crs softwareversion 12r1-rac2
Oracle Clusterware version on node [12r1-rac2] is [12.1.0.1.0]
[oracle@12r1-rac1 ~]$

Step 2: DB files
Restore the backup of datafiles,redo logs,control file to a shared location on the cluster.
Here as we already have a single instance database running on a storage which is shared by the nodes, we can skip this step. For this, migration from non ASM to ASM has to be performed. RMAN duplicate can be used or datapump can be used if the database is smaller in size. Option is yours...

Step 3: PFILE
Create pfile from memory
SQL> create pfile='/oracle/app/product/12.1/dbs/initnonplug1.ora' from memory;

File created.

SQL>

Add the following lines to the pfile that we have for the single instance database.

*.cluster_database = TRUE 
*.cluster_database_instances = 2 
*.undo_management=AUTO 
nonplug1.undo_tablespace=undotbs1 # (undo tablespace which already exists) 
nonplug1.instance_name=nonplug1 
nonplug1.instance_number=1 
nonplug1.thread=1 
nonplug1.local_listener=LISTENER_12r1rac1 # <LISTENERNAME>_<HOSTNAME1>
nonplug2.instance_name=nonplug2 
nonplug2.instance_number=2 
nonplug2.local_listener=LISTENER_12r1rac2 # <LISTENERNAME>_<HOSTNAME2>
nonplug2.thread=2 
nonplug2.undo_tablespace=UNDOTBS2 
nonplug2.cluster_database = TRUE 
nonplug2.cluster_database_instances = 2

Edit the created pfile to add the above parameters and copy to the other cluster node as below.
[oracle@12r1-rac1 dbs]$ hostname
12r1-rac1.selvapc.com
[oracle@12r1-rac1 dbs]$ vi initnonplug1.ora
[oracle@12r1-rac1 dbs]$ scp initnonplug1.ora oracle@12r1-rac2.selvapc.com:/oracle/app/product/12.1/dbs/initnonplug2.ora
initnonplug1.ora                                                                                                                      100% 1039     1.0KB/s   00:00

Step 4: Create redo and undo for second instance
SQL> alter database add logfile thread 2 group 3 ('+DATA') size 100m;

Database altered.

SQL> alter database add logfile thread 2 group 4 ('+DATA') size 100m;

Database altered.

SQL> alter database enable public thread 2;

Database altered.

SQL> create undo tablespace UNDOTBS2 datafile  '+DATA' size 200M;

Tablespace created.

Step 5: Listener check
If the single instance database listener is running and using the same port as of RAC listener, then stop the listener and configure the listener through "NETCA" using cluster RDBMS home.

I now have one local listener on each servers LISTENER_12R1RAC1 & LISTENER_12R1RAC2 and 3 scan listeners in total. The local listeners run on port 1522 and scan listeners on default port 1521.
[oracle@12r1-rac1 ~]$ ps -ef|grep inhe
oracle    3449     1  0 Jan01 ?        00:00:00 /u01/oracle/app/product/12.1/bin/tnslsnr LISTENER_SCAN3 -no_crs_notify -inherit
oracle    3459     1  0 Jan01 ?        00:00:00 /u01/oracle/app/product/12.1/bin/tnslsnr LISTENER_SCAN2 -no_crs_notify -inherit
oracle   11313     1  0 00:32 ?        00:00:00 /oracle/app/product/12.1/bin/tnslsnr LISTENER_12R1RAC1 -inherit
oracle   11474  9469  0 00:35 pts/0    00:00:00 grep inhe

[oracle@12r1-rac2 ~]$ ps -ef|grep inhe
oracle    3188     1  0 Jan01 ?        00:00:00 /u01/oracle/app/product/12.1/bin/tnslsnr LISTENER_SCAN1 -no_crs_notify -inherit
oracle    9969     1  0 00:34 ?        00:00:00 /oracle/app/product/12.1/bin/tnslsnr LISTENER_12R1RAC2 -inherit
oracle   10042  5415  0 00:36 pts/0    00:00:00 grep inhe
[oracle@12r1-rac2 ~]$
You might get this below error
ORA-00119: invalid specification for system parameter LOCAL_LISTENER
ORA-00132: syntax error or unresolved network name 'LISTENER_12r1rac1'

So to avoid this, entries to the tnsnames.ora should be made as below on servers 12r1-rac1 (LISTENER_12r1rac1) and 12r1-rac2 (LISTENER_12r1rac2).

LISTENER_12r1rac1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 12r1-rac1)(PORT = 1522))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = nonplug)
    )
  )

LISTENER_12r1rac2 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 12r1-rac2)(PORT = 1522))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = nonplug)
    )
  )

Step 6: Shut down the database
SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

Step 7: Start both instances with proper environment settings
Recreate the password file which can be utilized by both instances separately. Set the new environments and startup the database.
[oracle@12r1-rac1 dbs]$ export ORACLE_SID=nonplug1
[oracle@12r1-rac1 dbs]$ export ORACLE_HOME=/oracle/app/product/12.1
[oracle@12r1-rac1 dbs]$ orapwd file= $ORACLE_HOME/dbs/orapwnonplug1 password=xxxxxxx
[oracle@12r1-rac1 dbs]$ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.1.0 Production on Sat Jan 2 01:16:19 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance
ORACLE instance started.

Total System Global Area 1068937216 bytes
Fixed Size                  2296576 bytes
Variable Size             348128512 bytes
Database Buffers          713031680 bytes
Redo Buffers                5480448 bytes
Database mounted.
Database opened.
SQL>

[oracle@12r1-rac2 ~]$ export ORACLE_SID=nonplug2
[oracle@12r1-rac2 ~]$ export ORACLE_HOME=/oracle/app/product/12.1
[oracle@12r1-rac2 ~]$ orapwd file=$ORACLE_HOME/dbs/orapwnonplug2 password=xxxxxxx
[oracle@12r1-rac2 ~]$ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.1.0 Production on Sat Jan 2 01:19:38 2016

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup
ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance
ORACLE instance started.

Total System Global Area 1068937216 bytes
Fixed Size                  2296576 bytes
Variable Size             348128512 bytes
Database Buffers          713031680 bytes
Redo Buffers                5480448 bytes
Database mounted.
Database opened.
SQL>

Step 8: Register RAC instances with CRS
Register the instances with the SRVCTL utility with CRS and stop and start the database using SRVCTL to complete the conversion process. 
[oracle@12r1-rac1 dbs]$ srvctl add database -d nonplug -o /oracle/app/product/12.1
[oracle@12r1-rac1 dbs]$ srvctl add instance -d nonplug -i nonplug1 -n 12r1-rac1
[oracle@12r1-rac1 dbs]$ srvctl add instance -d nonplug -i nonplug2 -n 12r1-rac2
[oracle@12r1-rac1 ~]$ srvctl stop database -d nonplug
PRCC-1016 : nonplug was already stopped
[oracle@12r1-rac1 ~]$ srvctl status database -d nonplug
Instance nonplug1 is not running on node 12r1-rac1
Instance nonplug2 is not running on node 12r1-rac2
[oracle@12r1-rac1 ~]$ srvctl start database -d nonplug
[oracle@12r1-rac1 ~]$ srvctl status database -d nonplug
Instance nonplug1 is running on node 12r1-rac1
Instance nonplug2 is running on node 12r1-rac2
[oracle@12r1-rac1 ~]$ 
Step 9: Create spfile
Create spfile and restart the database.
Create spfile using the following command. Best practice is to create spfile in ASM storage and hence lets do it by the following.
SQL> create spfile='+DATA/spfilenonplug.ora' from pfile;

File created.

SQL> exit
Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Advanced Analytics and Real Application Testing options
[oracle@12r1-rac1 ~]$ srvctl stop database -d nonplug
[oracle@12r1-rac1 ~]$ ps -ef|grep pmon
oracle    3156     1  0 09:01 ?        00:00:01 asm_pmon_+ASM1
oracle   27179 21479  0 12:08 pts/0    00:00:00 grep pmon
[oracle@12r1-rac1 ~]$ srvctl start database -d nonplug
[oracle@12r1-rac1 ~]$ ps -ef|grep pmon
oracle    3156     1  0 09:01 ?        00:00:01 asm_pmon_+ASM1
oracle   27229     1  0 12:09 ?        00:00:00 ora_pmon_nonplug1
oracle   27716 21479  0 12:10 pts/0    00:00:00 grep pmon
[oracle@12r1-rac1 ~]$
Step 10: Post conversion verification and checks
Perform the below following as a verfication and checks. 
SQL> select * from v$active_instances;

INST_NUMBER INST_NAME                                    CON_ID
----------- ---------------------------------------- ----------
          1 12r1-rac1.selvapc.com:nonplug1                    0


          2 12r1-rac2.selvapc.com:nonplug2                    0

Check whether all the resources are online with the following commands. 
[oracle@12r1-rac2 ~]$ crsctl status resource -t
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.DATA.dg
               ONLINE  ONLINE       12r1-rac1                STABLE
               ONLINE  ONLINE       12r1-rac2                STABLE
ora.asm
               ONLINE  ONLINE       12r1-rac1                Started,STABLE
               ONLINE  ONLINE       12r1-rac2                Started,STABLE
ora.net1.network
               ONLINE  ONLINE       12r1-rac1                STABLE
               ONLINE  ONLINE       12r1-rac2                STABLE
ora.ons
               ONLINE  ONLINE       12r1-rac1                STABLE
               ONLINE  ONLINE       12r1-rac2                STABLE
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.12r1-rac1.vip
      1        ONLINE  ONLINE       12r1-rac1                STABLE
ora.12r1-rac2.vip
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.LISTENER_SCAN1.lsnr
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.LISTENER_SCAN2.lsnr
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.LISTENER_SCAN3.lsnr
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.cvu
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.nonplug.db
      1        ONLINE  ONLINE       12r1-rac1                Open,STABLE
      2        ONLINE  ONLINE       12r1-rac2                Open,STABLE
ora.oc4j
      1        OFFLINE OFFLINE                               STABLE
ora.scan1.vip
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.scan2.vip
      1        ONLINE  ONLINE       12r1-rac2                STABLE
ora.scan3.vip
      1        ONLINE  ONLINE       12r1-rac2                STABLE
--------------------------------------------------------------------------------
[oracle@12r1-rac2 ~]$ crs_stat -t # This is a depricated command from Oracle version 11R2 but still works.
Name           Type           Target    State     Host
------------------------------------------------------------
ora....SM1.asm application    ONLINE    ONLINE    12r1-rac1
ora....ac1.ons application    ONLINE    ONLINE    12r1-rac1
ora....ac1.vip ora....t1.type ONLINE    ONLINE    12r1-rac1
ora....SM2.asm application    ONLINE    ONLINE    12r1-rac2
ora....ac2.ons application    ONLINE    ONLINE    12r1-rac2
ora....ac2.vip ora....t1.type ONLINE    ONLINE    12r1-rac2
ora.DATA.dg    ora....up.type ONLINE    ONLINE    12r1-rac1
ora....N1.lsnr ora....er.type ONLINE    ONLINE    12r1-rac2
ora....N2.lsnr ora....er.type ONLINE    ONLINE    12r1-rac2
ora....N3.lsnr ora....er.type ONLINE    ONLINE    12r1-rac2
ora.asm        ora.asm.type   ONLINE    ONLINE    12r1-rac1
ora.cvu        ora.cvu.type   ONLINE    ONLINE    12r1-rac2
ora....network ora....rk.type ONLINE    ONLINE    12r1-rac1
ora.nonplug.db ora....se.type ONLINE    ONLINE    12r1-rac1
ora.oc4j       ora.oc4j.type  OFFLINE   OFFLINE
ora.ons        ora.ons.type   ONLINE    ONLINE    12r1-rac1
ora.scan1.vip  ora....ip.type ONLINE    ONLINE    12r1-rac2
ora.scan2.vip  ora....ip.type ONLINE    ONLINE    12r1-rac2
ora.scan3.vip  ora....ip.type ONLINE    ONLINE    12r1-rac2
[oracle@12r1-rac2 ~]$
If you would like to stop and start the entire cluster you can do this by the below command. This is optional.

crsctl stop cluster –all

Verify the cluster by the following command using cluvfy utility
[oracle@12r1-rac1 ~]$ cluvfy comp crs -n all -verbose

Verifying CRS integrity

Checking CRS integrity...

Clusterware version consistency passed.
The Oracle Clusterware is healthy on node "12r1-rac1"
The Oracle Clusterware is healthy on node "12r1-rac2"

CRS integrity check passed

Verification of CRS integrity was successful.
[oracle@12r1-rac1 ~]$
Other optional checks include checking the logs related to Cluster, Database and instances when you install and perform any operations to make sure you don't have any unexpected issues.
Also configure Backup and all the monitoring scripts as per your organisation standards.
Go through the check list once again to see that you have not missed any checks to make everything perfect.

Happy RACing!!

2 comments:

  1. Thank you Selvakumar for sharing this nice post,
    Foued

    ReplyDelete
    Replies
    1. Hi,
      Thanks for your comment! You are most welcome!

      Delete