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Requirements for Conversion

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 system must meet the following hardware and software requirements to convert to RAC:

* Be able to run a cluster file system

* Have the required additional license(s) for Oracle Database 10g Enterprise Edition with RAC.

* Have at least two network interface cards of at least 100 mbit/sec, the preference is a Gigabyte or better, communication speed. One for the public and virtual private interface and the other for the RAC cluster interconnect.

* Have shared disk storage

The conversion from a single instance to clustered configuration will be covered first.

Conversion from Single Instance to Cluster-Enabled System Administrative Concerns

Before beginning the conversion to RAC, the following administrative considerations should be addressed:

* Make sure there are adequate backup procedures before converting from a single instance Oracle database to RAC. This may involve the use of RMAN, transportable tablespaces or the RMAN CONVERT utility.

* The additional archiving considerations that apply in RAC environments must be considered. For example, the archive file format requires a thread number.  This is done automatically for DBCA created RAC instances. In addition, the archived logs from all instances of a RAC database are required for media recovery. This means that if information is archived to a file and a cluster file system is not in used, a method of accessing the archive logs from all nodes on which the cluster database has instances, such as NFS, is required where file systems are not shared.

All right, the following section provides more information on the actual conversion procedure from single instance to RAC on Oracle Database 10g.

Converting from Single Instance to 10g RAC

It is strongly recommended that the Database Configuration Assistant (DBCA) be used to convert from single instance Oracle to 10g RAC. Oracle has added many new features such as CRS, Virtual IP management, and GRID control which can make the conversion difficult. Use of the DBCA utility provides the following benefits:

* Automation of the configuration of the control file attributes

* Creation of the needed undo tablespaces and the redo logs

* Makes the initialization parameter file entries for cluster-enabled environments.

* Configuration of the Oracle Net Services

* Configuration of the Cluster Ready Services (CRS) resources

* Configuration of the EM (Grid control) and SRVCTL to allow for RAC database management

This section will describe the following procedures:

* Conversion of a single instance on a Non-Clustered system to Oracle Database 10g with RAC

* Conversion of a single instance on a Cluster to Oracle Database 10g RAC

Single Instance on a Non-Clustered System to Oracle Database 10g with RAC

Conversion from a single instance, non-clustered database to a clustered RAC system involves the following procedures, performed in the order given:

* Backup the original single instance database.

* Perform the required pre-installation steps

* Set up the cluster environment

* Copy the preconfigured database image into the cluster

* Install the Oracle Database 10g RAC software

The following sections will detail each of these procedures.

Duplication of the Original Single Instance Database

The Database Configuration Assistant (DBCA) should be used to create a preconfigured image of the single instance database. This is accomplished by invoking the DBCA from the bin directory under oracle_home and following the menu path as follows:  Welcome Manage Templates --> Create a database template [select From an existing database (structure as well as data)] --> Database Name [select the database name] --> Template Name [enter template name, use database name as the default, and description and template datafile location] --> Finish.

The DBCA will then generate two files:

* The database structure file (template_name.dbc)

* The database preconfigured image file (template_name.dfb)

By default, these files are generated on UNIX in the oracle_home/assistants/dbca/templates directory and in the %oracle_home%\assistants\dbca\templates directory on Windows -based systems.


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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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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