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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Conclusion

Proper implementation of a strategy that considers these points will make the system more robust and scalable.

The old 80/20 rule applies here; 80% or more of the overhead results from 20% or less of the workload. If the 20% is fixed by observing some simple guidelines, then tangible benefits can be achieved with minimal effort. Workload problems can be corrected by implementing any or all of the following:

  • Use Oracle automated free list management, or define free list groups for partitioned, as well as non-partitioned, data that is frequently modified.

  • Use read-only tablespaces wherever data remains constant.

  •  Use locally managed tablespaces to reduce extent management costs.

  • Use Oracle sequences to generate unique numbers and set the CACHE parameter to high value, if needed.

  • Use sequence staggering to help prevent index block contention.

  •  If possible, reduce concurrent changes to index blocks. However, if index key values are not modified by multiple instances, or if the modification rate is not excessive, the overhead may be acceptable. In extreme cases, techniques like physical table partitioning can be applied.

References

Metalink Note: 226880.1: Configuration of Load Balancing and Transparent Application Failover

OOW 2003 Presentation 32035: Oracle 9i RAC: A Case Study, Steve Teeters, Science Applications International Corporation, Bobby Hampton, Science Applications International Corporation

OOW 2003 Presentation 32949: Oracle 9i Real Application Clusters Helping Southwest Airlines Take Off, Kerry Schwab. Director IT, Southwest Airlines

OOW 2003 Presentation 33433: Oracle RAC and Linux in
the real enterprise, Mark Clark, Director, Merrill Lynch Europe PLC, Global Database Technologies

SEOUC 2003 Presentation: A Bare Bones RAC Installation, Michael R. Ault, Senior Technical Management Consultant, TUSC Inc - The Oracle Experts

UKOUG 2001 Presentation: Advantages of Oracle9i Real Application Clusters, Michael R. Ault, Senior Technical Management Consultant, TUSC Inc - The Oracle Experts.

Oracle Real Application Clusters Deployment and Performance Guide 10g Release 1 (10.1), Part Number B10768-01

Oracle Real Application Clusters Administrator's Guide 10g Release 1 (10.1) Part Number B10765-01

Oracle Real Application Clusters Installation and Configuration Guide 10g Release 1 (10.1) for AIX-Based Systems, hp HP-UX PA-RISC (64-bit), hp Tru64 UNIX, Linux, Solaris Operating System (SPARC 64-bit) Part No. B10766-01


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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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.

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