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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Proper Sequence Usage

In some applications, the sequence numbers used must be sequential, an example would be the line numbers for a purchase order, or perhaps check numbers for an automatic check printer. In this case, a sequence table may have to be used to store the highest sequence number. The value is read from the sequence table, increased by one, and then updated. While all of this occurs, the row for the sequence being used is locked, thus no one else can use it. If you must use this type of logic, place the table in a tablespace with a 2048 block size, and set the pctfree high enough that only one row per block is allowed. This will reduce the chances of intra-instance pinging (assuming you have more than one sequence stored in the table).

Tablespace Design in Real Application Clusters

The goal in tablespace design is to group database objects according to their data access distribution patterns. The dependency analysis and transaction profiles of the database must be considered, then tablespaces are divided into containers for the following objects:

  • Frequently and randomly modified tables and indexes belonging to particular functional areas.

  • Frequently and randomly modified tables and indexes with a lower probability of having affinity to any functional area.


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.

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

 
 
 

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