Call for Oracle support & training (800) 766-1884
Free Oracle Tips

Corporate Oracle Training
Custom Oracle Training
Oracle New Features Training
Advanced Oracle DBA Classes
Oracle Tuning Courses
Oracle Tips & Tricks
Oracle Training Links
Oracle Training Links
Oracle Training Links

We are top for USA Oracle Training Clients


Free Oracle Tips


Free Oracle App Server Tips


Oracle support

Oracle training

Oracle tuning


Remote Oracle

Custom Oracle Training


  Oracle Tips by Burleson

Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Creating Efficient RAC Data Objects

The figure shows the effects of a poor clustering factor when the data in a table is poorly ordered, thus spreading data blocks containing index-sequential data across multiple instances. This random scattering of data into data blocks results in the possibility of multiple data blocks being required by a single instance to satisfy a range type query against a single index node. The result is the false-pinging of data blocks between instances.

Neither situation is desirable. Use the reverse-key index method when multiple-instances will require access to current data referenced in ascending numeric key or date key indexes. Use method two when data is usually accessed by an index range scan for specific periods from the individual instances. Method two is also good for concatenated indexes.

What about character-based indexes? By design, character-based indexes will always be random (unless the table is sorted in character index order). This is because a character-based index organizes the data reference pointers in alphabetical order, while the data will usually be in natural insert order, based on the mean-frequency charts for the specific language the database uses. Character-based indexes will always be skewed towards those letters that appear most frequently in the leading portions of the words for a given language (in English the letters N, R, S, L, and T lead the frequency charts).

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.

Remote DBA Services

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


Oracle performance tuning book



Oracle performance tuning software

Oracle performance tuning software
Oracle performance Tuning 10g reference poster
Oracle training in Linux commands
Oracle training Excel


email BC:

Copyright © 1996 -  2014 by Burleson Inc. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.