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Oracle10g Grid Computing with RAC
Chapter 3 - High Performance and Highly Available
Database Clusters

Issues with FO Clusters – Hidden Risks

  • Maintenance and backup is a challenge. In the case of an active/active architecture for a database cluster, the executables and other related files that you store on local storage have to be kept synchronized. Any mismatch of executables or patches might have an effect on the start up of the standby database during the fail over process.

  • Configuration of the critical resources that make up resource or service group is very significant and careful thought has to be given to the design configuration. Dependencies have to be accurately reflected, for example, in a service group, MQ Series, the database instance and Listener are defined as critical resources. In this situation, even if MQ-series fails for any reason, the database instance and listener are brought down or failover unnecessarily.

So far, we have covered many details about the FO Clusters and Database deployment and failure process. Now let us move on to basic features of parallel scalable clusters.

Parallel Database Clusters

The Parallel Clustered Database (PDB) is a complex application, which provides access to the same database, (group of data tables, indexes and other objects) from any server in the cluster concurrently without compromising on data integrity. Well known examples include Oracle Real Application Cluster (Oracle RAC), the subject matter of this book, IBM UDB DB2 Enterprise Extended Edition (EEE) and IBM S/390 Parallel Sysplex Clusters.

Parallel Databases typically contain multiple nodes (or servers) accessing the same physical storage or data concurrently. PDB Architecture allows multi-server data sharing technology, allowing direct, concurrent read/write access to shared data from all the processing nodes in the parallel configuration. This, however, necessitates complex lock management to maintain the data integrity and resource coordination.

In terms of storage access type, a Parallel Clustered System is implemented in two ways, the Shared Nothing Model and the Shared Disk Model.

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.

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Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

  • Answering questions from your Oracle DBA technical staff

  • Repairing down production Oracle database systems

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