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

UDB EEE Architecture

Another competing Parallel Database that follows the Shared Nothing Architecture is DB2 UDB Enterprise-Extended Edition (EEE). This product follows the shared nothing model with each node having its own set of disks. Each instance or node has ownership of a distinct subset of the data and all access to this data is performed by this owning instance. Thus, it is a partition database (Fig. 3.13). However, the disks are attached to more than one node physically. In case of a node failure, ownership of disk subsystem moves over to another node.

The basic method UDB (EEE) follows is the distribution of the data and database functions to multiple hosts. It uses a hashing algorithm that enables it to manage the distribution (and redistribution) of data as required. A database partition is a part of the database that has its own portion of the user data, indexes, configuration files, and transaction logs.


Figure 3.13  UDB (EEE) Three Node Cluster

The Shared nothing architecture allows parallel queries to be processed with the minimum of contention for resources between the hosts in the DB2 cluster. Because the number of data partitions has little impact on traffic between hosts, performance scales better in an almost linear manner as you add more machines to your DB2 cluster.

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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