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

UDB EEE Architecture

UDB (EEE) uses the concept of function shipping. Function shipping helps in the reduction of network traffic because functions, such as SQL queries, are shipped instead of data. Function shipping means that relational operators are executed on the node (or processor) containing the data whenever possible. So, the operation (or the SQL) is moved to where the data resides. Function shipping is well suited to the shared nothing architecture model.

In case of the failure of one node, a pre-configured node takes over the disk system and makes the data available through that node. A Cluster script starts DB2 UDB EEE database partitions on the take-over node. Once this script completes, all the database partitions in the DB2 UDB EEE database are available and processing goes on as usual.

As an example, When RS/6000 SP cluster is implemented with HACMP to support the UDB EEE, nodes are usually configured in three ways:

  • Idle Standby - A standby SP node can be provided which will take over the work of a failed SP node. The standby SP node has access to all resources required for the provision of the essential services: disks, networks and so on. When the failed SP node is fixed and reintegrated into the cluster, it will reclaim its resources.

  • Rotating Standby - A standby SP node is provided to take over the work of a failed SP node, as in the idle standby scenario. However, when the failed SP node is reintroduced, it does not reclaim its resources, but becomes the new standby machine.

  • Mutual Takeover - There are no standby SP nodes; all SP nodes are utilized in a normal state. After an SP node failure, the failed SP nodes resources and essential services are taken over by one of the surviving SP nodes in addition to its normal services.

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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