Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 15 - RAC Migration Topics

RAC Migration Overview

With the advances in RAC technology in Oracle 10g and RAC cluster databases utilizing Grid technology, there is increased interest among many Oracle database customers in using the new features and converting their existing Oracle database to an Oracle RAC database.  The current standalone database may be in various conditions.  The database may be in 10g stand-alone, or may be in the 9i version or, even still, be in lower releases. At the same time, the server environment may not be from the Oracle certified hardware list. Based on these various factors, the DBA needs to develop an appropriate migration plan.

From an application point of view, there may be certain additional requirements and modifications needed to access the RAC database. Once the database is migrated to a RAC database, the client applications can either use load-balancing via Oracle*Net configurations, or access a specific database instance of the RAC database.  In case of packaged applications that, with this upgrade, will just begin accessing the RAC database, appropriate configuration changes have to be performed. For example, in the Oracle eBusiness suite, in order to use RAC, cookies must be set up. In the SAP infrastructure, you may have to replace the SAP software library, 'dboraslib,with the latest RAC supported version.

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