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Upgrading and Downgrading the OCR in RAC

Oracle RAC Cluster Tips by Burleson Consulting

This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters.  To get immediate access to the code depot of working RAC scripts, buy it directly from the publisher and save more than 30%.

When CRS is installed, Oracle automatically executes the ocrconfig ?upgrade command. To downgrade, follow the downgrade instructions for each CRS component and also downgrade the OCR using the ocrconfig -downgrade command.

Cluster Database Configuration Import and Export with SRVCONFIG

Use SRVCONFIG utility to import and export SRVM cluster database configuration information to and from the OCR. For example, the following command exports the configuration information to a text file (replace the file_name.txt with the desired file name):

srvconfig -exp file_name.txt

While the following command would be used to import the configuration information from a text file into the OCR:

srvconfig -imp file_name.txt




To change OCR backup file location. For this entry, use a full path that is accessible by all nodes.


To display the location, timestamp, and the node name of origin for the last three automatically created backup files.


To upgrade the OCR to a later version.


To downgrade the OCR to an earlier version.


To display help for the ocrconfig commands.

Table 8.13: Common SRVCONFIG command options

GSD daemon

The GSD daemon has been replaced with the CRS in Oracle Database 10g.

Using SQL*Plus

SQL*plus can also be used to administer the RAC system.  It uses SQL statements to perform necessary tasks. Prior to executing SQL*plus commands, ensure that the cluster manager is running and the nodes are valid.

Starting the database in Cluster mode

After ensuring that the cluster nodes are valid, the cluster manager component is running, and the shared storage is accessible, start the database on one of the nodes through SQL*plus.

On a UNIX Platform:

sqlplus /nolog
connect sys/<password> as sysdba
startup PFILE=init$ORACLE_sid.ora

On a Windows Platform:

Ensure that the OracleServicesid service is running. If not, start at the DOS command prompt:

> net start OracleServicewsid


sqlplus /nolog
connect sys/<password> as sysdba
startup PFILE=%ORACLE_HOME%\database\initsid.ora

The first instance in cluster mode determines the values of the global parameters for the other instances that may join later. When second and subsequent instances join the cluster, Oracle compares the values of any global parameters in its parameter file with those already in use. An instance cannot join the database unless it has the comparable values for its global parameters.

To launch the subsequent instances on other nodes, use the same startup commands shown above with SQL*plus. Since the first instance is already running, the subsequent instances join the clustered database.


This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters, Rampant TechPress, by Mike Ault and Madhu Tumma.

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


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