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

UDB EEE Architecture

DB2 UDB EEE supports a diverse set of hardware options including SMP, MPP, NUMA, and RISC servers, and clustered configurations with a range of interconnect options. DB2 exploits high-availability solutions on each platform. DB2 UDB EEE can run on multiple operating systems including IBM AIX, Linux, HP-UX, Sun Solaris, and Windows NT.

General Requirements for Parallel Database Clusters

In this section, let us examine the critical issues pertaining to the scalable cluster and the parallel database:

  • Avoiding Split Brain

  • I/O Fencing

  • Arbitration through Quorum Disks

  • Cache Coherency and Lock Management

Avoiding Split Brain 

It is reasonable to expect that server components are prone to failures. It is the responsibility of the cluster to detect and monitor and stabilize the application running on the cluster. Clusters Systems are geared to handle peculiar situations like Amnesia and Split Brain conditions.

Amnesia occurs when the cluster restarts after a shutdown with cluster data older than at the time of the shutdown. This can happen if multiple versions of the framework data are stored on disk and a new incarnation of the cluster is started when the latest version is not available.

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.

Oracle Consulting Services

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

  • One-time Oracle tuning evaluation

  • Guru support for your Oracle DBA

  • Installation of Oracle application packages

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