11 Adding and Deleting Oracle RAC from Nodes on Windows Systems

Using DBCA in Interactive Mode to Add Database Instances to Target Nodes

To add a database instance to a target node using DBCA in interactive mode, perform the following steps:

1. Ensure that your existing nodes have the Oracle home environment variable set correctly.

2. Start DBCA by entering dbca at the system prompt from the Oracle_home\bin directory on an existing node.

   DBCA performs certain CVU checks while running. However, you can also run CVU from the command line to perform various verifications.

   See Also:

   Oracle Clusterware Administration and Deployment Guide for more information about CVU

   DBCA displays the Welcome page for Oracle RAC. Click Help on any DBCA page for additional information.

3. Select Oracle Real Application Clusters database, click Next, and DBCA displays the Operations page.

4. Select Instance Management, click Next, and DBCA displays the Instance Management page.

5. Select Add Instance and click Next. DBCA displays the List of Cluster Databases page that shows the databases and their current status, such as ACTIVE or INACTIVE.

6. From the List of Cluster Databases page, select the active Oracle RAC database to which you want to add an instance. Enter the user name and password for a database user that has SYSDBA privileges. Click Next and DBCA displays the List of Cluster Database Instances page showing the names of the existing instances for the Oracle RAC database that you selected.

7. Click Next to add a new instance and DBCA displays the Adding an Instance page.

8. On the Adding an Instance page, enter the instance name in the field at the top of this page if the instance name that DBCA provides does not match your existing instance naming scheme. Then select the new node name from the list, click Next, and DBCA displays the Services Page.

9. Enter the services information for the new node's instance, click Next, and DBCA displays the Instance Storage page.

10. If you are using Oracle ASM or a cluster file system, then click Finish on the Instance Storage page.

11. Review the information on the Summary dialog and click OK or click Cancel to end the instance addition operation. The DBCA displays a progress dialog showing DBCA performing the instance addition operation. When DBCA completes the instance addition operation, DBCA displays a dialog asking whether you want to perform another operation.

12. After you terminate your DBCA session, run the following command to verify the administrative privileges on the new node and obtain detailed information about these privileges where nodelist consists of the newly added nodes:

    cluvfy comp admprv -o db_config -d oracle_home -n nodelist [-verbose]
    

13. Perform any necessary service configuration procedures, as described in Chapter 5, "Introduction to Automatic Workload Management".

Using DBCA in Silent Mode to Add Database Instances to Target Nodes

You can use DBCA in silent mode to add instances to nodes on which you have extended an Oracle Clusterware home and an Oracle Database home. Use the following syntax:

dbca -silent -addInstance -nodeList node_name -gdbName gdb_name
[-instanceName instance_name -sysDBAUserName sysdba -sysDBAPassword password]

Perform any necessary service configuration procedures, as described in Chapter 5, "Introduction to Automatic Workload Management".

Using DBCA in Interactive Mode to Delete Instances from Nodes

To delete an instance using DBCA in interactive mode, perform the following steps:

1. Verify there is a current backup of OCR.

   Run the ocrconfig -showbackup command to ensure there is a valid backup.

2. Start DBCA.

   Start DBCA on a node other than the node that hosts the instance that you want to delete. The database and the instance that you plan to delete should continue to be started and running during this step.

3. On the DBCA Welcome page select Oracle Real Application Clusters Database, click Next, and DBCA displays the Operations page.

4. On the DBCA Operations page, select Instance Management, click Next, and DBCA displays the Instance Management page.

5. On the Instance Management page, select Delete Instance, click Next, and DBCA displays the List of Cluster Databases page.

6. Select an Oracle RAC database from which to delete an instance. Enter a user name and password for the database user that has SYSDBA privileges. Click Next and DBCA displays the List of Cluster Database Instances page. The List of Cluster Database Instances page shows the instances that are associated with the Oracle RAC database that you selected and the status of each instance.

7. On the List of Cluster Databases page, select the Oracle RAC database from which to delete the instance, as follows:

   1. On the List of Cluster Database Instances page, DBCA displays the instances that are associated with the Oracle RAC database that you selected and the status of each instance. Select the cluster database from which you will delete the instance. Click Finish.

   2. Click OK on the Confirmation dialog to proceed to delete the instance.

   3. Click OK on the next Confirmation dialog to delete the instance and related Optimal Flexible Architecture (OFA) directory structure.

      DBCA displays a progress dialog showing that DBCA is deleting the instance. During this operation, DBCA removes the instance and the instance's Oracle Net configuration. When DBCA completes this operation, DBCA displays a dialog asking whether you want to perform another operation.

      Click No and exit DBCA or click Yes to perform another operation. If you click Yes, then DBCA displays the Operations page.

8. Verify that the dropped instance's redo thread has been removed using SQL*Plus to query the V$LOG view from an existing instance. If the redo thread is not disabled, then disable the thread. For example:

   SQL> ALTER DATABASE DISABLE THREAD 2;
   

9. Verify that the instance has been removed from OCR by running the following command, where db_unique_name is the name of the database:

   srvctl config database -d db_unique_name
   

10. If you are deleting more than one node, then repeat these steps to delete the instances from all the nodes that you are going to delete.

Using DBCA in Silent Mode to Delete Instances from Nodes

You can use DBCA in silent mode to delete a database instance from a node.

Run the following command, where the variables are the same as those shown in Table 10-1 for the DBCA command to add an instance. Provide a node name only if you are deleting an instance from a node other than the one on where DBCA is running as shown in the following example where password is the SYSDBA password:

dbca -silent -deleteInstance [-nodeList node_name] -gdbName gdb_name
-instanceName instance_name -sysDBAUserName sysdba -sysDBAPassword password

At this point, you have accomplished the following:

• Deregistered the selected instance from its associated Oracle Net Services listeners

• Deleted the selected database instance from the instance's configured node

• Removed the Oracle Net configuration

• Deleted the Oracle Flexible Architecture directory structure from the instance's configured node.