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Oracle Database Creation

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%.

The Database Configuration Assistant (DBCA) can now be used to fully configure Real Application Clusters (RAC) environment. In order to use this new feature there are various prerequisites that must be met:

* Shared disk subsystem must in place. The details of which were covered extensively in the previous chapter. RAW partitions or Oracle Cluster File System or a certified CFS provided by the system vendor must be installed and configured. If planning to use the ASM, ASM resources (disk devices) should be available.

* Oracle Cluster Ready Services must be installed and configured. This encompasses what were formally Oracle Cluster Manager (oracm) and the global services daemon (GSD). In addition to GSD, the CRS starts the EVMD, CSSD, and CRSD daemons.

*  The Oracle Database 10g software must be installed, as described in the previous section.

Once the above prerequisites are met, the DBCA program will recognize that the system is running in a clustered environment and will provide the options of configuring the RAC environment. If the proper services are running, the DBCA will automatically provide the required configuration screens.

The DBCA processing steps are:

1. Depending on the type of storage that has been chosen, the DBCA will:

* If using Automatic Storage Management (ASM), then the DBCA will initialize the ASM subsystem and then start the ASM instance(s).

* If using CFS (Cluster File System), then the DBCA will validate the data file destination to be validly shared across all the nodes that are going to be part of the cluster database.

* If using raw devices, then the DBCA will validate the raw device tablespaces sizes and then validate their access permissions.

2. It obtains a variety of inputs from the DBA and then it creates the database.

3. It configures the Oracle network services.

4. Then, it creates and starts the high availability services.

5. Finally, it starts the listeners and database instances and then starts the high availability services.

Creating RAC Database with DBCA

Once the DBCA is invoked, the first page that the DBCA displays is the Welcome page for RAC as shown in Figure 6.27. However, the DBCA only displays this RAC specific Welcome page if it detects that the DBCA is running on a cluster node and the DBCA can communicate with Oracle Cluster Ready Services (CRS) previously installed by the OUI.

If the DBCA does not display the Welcome Page for RAC, then the DBCA was unable to detect that the clusterware (CRS) is running. If this happens, perform clusterware diagnostics by executing the olsnodes command. Once the DBCA RAC Welcome screen appears, create a RAC database:

Figure 6.27: DBCA Welcome Page for RAC

Select the Real Application Clusters database option and click Next, and the DBCA will display the Operations page. The DBCA only enables Instance Management and Services Management if there is at least one RAC database configured on the cluster.

Next, select Create A Database and then click Next, and the DBCA will display the Node Selection page.

Figure 6.28: DBCA Node Selection

The DBCA will highlight the local node by default. The DBA must select the other nodes to configure as members of the cluster database, and then click Next. The DBCA will then display the Database Templates page. If nodes that are part of the cluster installation do not appear on the Node Selection page, perform clusterware diagnostics by executing the olsnodes command.

The templates on the Database Templates page are the Data Warehouse, General Purpose, and Transaction Processing preconfigured templates. These templates include data files and specially configured options for each environment. However, the New Database template does not include data files or the specially configured options. Use a template with data files to create a preconfigured database. Select a template from which to create the cluster database.

Figure 6.29: DBCA Database Template Selection Page

Then click Next, and the DBCA will display the Database Identification page.

Figure 6.30: DBCA Database Identification Page

Then, enter the global database name and the Oracle system identifier (SID) prefix, as well as the SYS and SYSTEM user passwords, for the cluster database.

Figure 6.31: DBCA Database Credentials Page

Note: The global database name is limited to eight characters in length and must begin with an alphabetical character. The SID prefix must be between one and five characters in length and also begin with an alphabetical character. Allow space for as many characters as are required for the numeric designations of the instances, for example, 1-9 is one character; 10-99 would be two characters. The DBCA uses the SID prefix to generate a unique value for the oracle_sid for each instance.

Click Next, and the DBCA will display the Storage Options page. Use the Storage Options page to select a storage type for database creation. The Cluster File System option is the default. Select a storage option, click Next, and the DBCA displays the Database Components page.

Figure 6.32: DBCA Database Storage Options

At this point a prompt will appear requesting the Disk Discovery String and ASM parameter file name and other ASM credentials as shown in Figure 6.33.

Figure 6.33: DBCA ASM Instance Page

From this page, select the database components that are required for the database and their respective default tablespaces, then click Next, and the DBCA will display the Connection Options page.

On this page, enter the database connection choices, then click Next, and the DBCA will display the DBCA Database Services page. In this example, a service called SALES has been created, which uses two instances with equal preference for load balancing and follows the basic TAF policy.

Figure 6.34: DBCA Database Services Page


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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