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Tuesday, October 4, 2016

Converting into RAC instance

Converting into RAC instance

Add separate Undo Tablespaces

First, Create 2 UNDO tablespaces for the 2 instances.PLINKTST1 > create undo tablespace UNDOTBS1 datafile '+PWTEST_DATA' size 100M autoextend on next 50M maxsize 500M; 
Tablespace created.
 

PLINKTST1 > create undo tablespace UNDOTBS2 datafile '+PWTEST_DATA' size 100M autoextend on next 50M maxsize 500M;
 
Tablespace created.


Add new REDO thread and enable it
 
(otherwise it will give this error while starting the 2nd instance: ORA-01620: no public threads are available for mounting)


PLINKTST1 > alter database add logfile thread 2 group 10 '+PWTEST_DATA' size 100M;
Database altered.

PLINKTST1 > alter database add logfile thread 2 group 11 '+PWTEST_DATA' size 100M;
Database altered.


PLINKTST1 > alter database enable public thread 2;

Database altered.


RAC Specific parameters

Add all RAC specific parameters to the pfile (I simply uncommented the undo_tablespaces and the cluster_data parms as I already included those). If the RAC specific were not included earlier in the pfile, add those now. Here are the main ones -- *.cluster_database=true 
*.cluster_database_instances=2

PLINKTST1.local_listener='LISTENER_PLINKTST1'PLINKTST2.local_listener='LISTENER_PLINKTST2'
PLINKTST1.undo_tablespace='UNDOTBS1' 
PLINKTST2.undo_tablespace='UNDOTBS2'

PLINKTST1.instance_number=1
PLINKTST2.instance_number=2

PLINKTST1.thread=1
PLINKTST2.thread=2
Start the additional Listeners
We added a TNS entry for the LOCAL_LISTENER earlier. Lets start a new listener at that port (1522 in this case). 
Update the following files::
 


listener.ora
----------------

LISTENER_PLINKTST_RPTDB01-PWPRD =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = vip-rptdb01-pwprd)(PORT = 1522)(IP = FIRST))
(ADDRESS = (PROTOCOL = TCP)(HOST = rptdb01-pwprd)(PORT = 1522)(IP = FIRST))
)
)

SID_LIST_LISTENER_PLINKTST_DB01-PWPRD =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /d01/app/pwprd/product/10.2.0/pwprddb)
(PROGRAM = extproc)
)

Start the above listener. Also, add the TNS entry for the new database.tnsnames.ora 
--------------------
PLINKTST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = vip-rptdb01-pwprd)(PORT = 1522))
(ADDRESS = (PROTOCOL = TCP)(HOST = vip-rptdb02-pwprd)(PORT = 1522))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = PLINKTST)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
)
)
)

Shared pfile
Move the pfile to a shared location in ASM; restart instance 1; create all the appropriate directories on node2 and start the instance 2.
If you get the following error, make sure you've created the additional thread and enabled it (see the section "Add new REDO thread and enable it") --

PLINKTST2 > startup
ORACLE instance started.

Total System Global Area 1073741824 bytes
Fixed Size 2144432 bytes
Variable Size 257247056 bytes
Database Buffers 792723456 bytes
Redo Buffers 21626880 bytes
ORA-01620: no public threads are available for mounting
..
..
..
From node 1:
PLINKTST1 > alter database enable public thread 2;

Database altered.

..

The database should come up ok now.
PLINKTST2 > startup
ORACLE instance started.

Total System Global Area 1073741824 bytes
Fixed Size 2144432 bytes
Variable Size 257247056 bytes
Database Buffers 792723456 bytes
Redo Buffers 21626880 bytes
Database mounted.
Database opened.
PLINKTST2 > 


This completes create a RAC database using SQL*Plus. Next we should register all the resources with CRS.


Registering with CRS
$ srvctl add database -d PLINKTST -o /d01/app/pwprd/product/10.2.0/pwprddb
$ srvctl add instance -d PLINKTST -i PLINKTST1 -n rptdb01-pwprd
$ srvctl add instance -d PLINKTST -i PLINKTST2 -n rptdb02-pwprd
$ srvctl add service -d PLINKTST -s PLINKTSTSVC -r "PLINKTST1,PLINKTST2"


Check for all the services just registered.
$ . oraenv
ORACLE_SID = [PLINKTST1] ? CRS

$ crs_stat |grep PLINK
NAME=ora.PLINKTST.PLINKTST1.inst
NAME=ora.PLINKTST.PLINKTST2.inst
NAME=ora.PLINKTST.PLINKTSTSVC.PLINKTST1.srv
NAME=ora.PLINKTST.PLINKTSTSVC.PLINKTST2.srv
NAME=ora.PLINKTST.PLINKTSTSVC.cs
NAME=ora.PLINKTST.db

All the new resources have been registered with CRS.

1 comment:

Sridevi Koduru (Oracleappstechnical.com) said...

Regards
Sridevi Koduru (Senior Oracle Apps Trainer Oracleappstechnical.com)
LinkedIn profile - https://in.linkedin.com/in/sridevi-koduru-9b876a8b
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