How to remove Oracle RAC

Oracle RAC is a powerful data management technology that allows multiple computers to access and use the database at the same time. While Oracle RAC is a great technology, there are times when Oracle RAC needs to be removed for maintenance or updates. In this article, we will discuss how to remove Oracle RAC.

Before removing Oracle RAC, you should back up all data. Depending on your configuration, you may need to back up data on all computers. Backing up your data ensures that your data is not lost during the deletion process. Additionally, you should have all users log out of the Oracle RAC system and stop the RAC cluster service. After completing these steps, you can remove Oracle RAC by following these steps:

Step 1: Stop the Oracle RAC instance

Before stopping Oracle RAC, you need to confirm that the instance on each node has been stop. You can perform the following steps to stop an Oracle RAC instance:

• Open SQL Plus and log in with SYSDBA permissions.
• Run the SHUTDOWN IMMEDIATE command to shut down the RAC instance.

This will stop all instances on the node.

Step 2: Stop the Oracle RAC cluster service

Before stopping the Oracle RAC cluster service, you need to confirm whether the cluster service on each node has been stopped. You can perform the following steps to stop the Oracle RAC cluster service:

• Log in to each node as the root user.
• Execute the following command to stop the Oracle RAC cluster service:

$ srvctl stop nodeapps -n

This will stop all cluster services on the node.

Step 3: Delete the Oracle RAC database

Before deleting the Oracle RAC database, you need to confirm that all instance and cluster services have been stopped. You can perform the following steps to delete the Oracle RAC database:

• Open SQL Plus and log in with SYSDBA permissions.
• Run the DROP DATABASE command to delete the RAC database.

This will delete the entire RAC database. If you only want to delete a specific instance, use the DROP INSTANCE command.

Step 4: Remove Oracle RAC software

Before removing Oracle RAC software, you need to confirm that all databases have been deleted. You can perform the following steps to remove Oracle RAC software:

• Log in to each node as the root user.
• Execute the following command to delete Oracle RAC software:

$ $ORACLE_BASE/product/11.2.0/dbhome_1/root.sh -deconfig

This will delete Oracle RAC software.

Step 5: Delete the Oracle RAC configuration file

Before deleting the Oracle RAC configuration file, you need to confirm that all Oracle RAC software has been deleted. You can perform the following steps to delete the Oracle RAC configuration file:

• Log in to each node as the root user.
• Execute the following command to delete the Oracle RAC configuration file:

$ rm -rf $ORACLE_HOME

This will delete all Oracle RAC configuration files.

Summary:

The above are the complete steps to delete Oracle RAC. Although removing Oracle RAC can be a bit complicated, it may be necessary when performing updates or other maintenance tasks. Make sure to back up all data before removing Oracle RAC and follow the above steps carefully to ensure that no data is lost.

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