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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Designing for High Performance

  • Understanding the workload on the system and planning the application to properly utilize resources.

Let's look at these factors for proper application design one-by-one, and see how they can be utilized to make RAC applications perform optimally.

Compartmenting Transactions to Specific Nodes

One obvious method of reducing pings between instances is to isolate the transactions that use a specific data set to a specific server in the RAC cluster. For example, in a multiuse instance that contains multiple applications, isolate each application’s user logins to a specific node (for example, sales users use the sales node, accounting uses the accounting node, and so on). In the case of a node failure, the users switch to one of the other nodes.

This compartmenting of transactions is difficult to implement for a large, multiuse RAC database where many different groups of users use each of the applications on the RAC cluster. In the case of a multi-use instance that is used by almost all corporate users, other techniques must be employed to optimize performance.

Creating Efficient RAC Data Objects

The creation of efficient RAC data objects entails using storage wisely in accordance with good RAC practices. Some of the good RAC practices, to put it quite frankly, waste disk and memory space to improve data sharing and dispersal characteristics.

An example of an efficient RAC object is one that is used by only a single instance at a time. To achieve this singularity of use, the rows-per-block (RPB) of the data object must be reduced. By reducing the RPB, the chances that multiple instances in the RAC cluster will require data in the same block are decreased. Here are several techniques to reduce the RPB in a RAC data object:

  • Use a smaller block size for objects that will be used across several instances.

  • Adjust pctfree to restrict the RPB (a higher pctfree will reduce the RPB).


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 Consulting can offer world-class remote Oracle database support at super-affordable prices.

Our remote Oracle DBA service provides 100% of the remote Oracle database administration needs for your company, and includes 24x7 access to our staff of 100% OCP Certified Oracle DBAs. 

We require a 12 month service commitment and include the following services:

  • Initial configuration review and problem identification
  • Installation of Oracle statistics collection mechanisms and quarterly database growth summaries
  • Hourly monitoring of your Oracle database for pending problems
  • Periodic performance analysis & identification of tuning activities
  • Twenty Four hour Oracle emergency support
  • Reporting and resolving all serious Oracle alert log messages
  • Free use of the BC TablePack, ServerPack and AuditPack services
  • Quick response emergency support for production database outages
  • Four hours of free remote DBA support every month. You can use these free hours for any DBA activity, including database analysis, system design, production migrations or personal mentoring.

For more information, please visit www.oracle-training.cc.

 
 
 

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