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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Tablespace Design in Real Application Clusters

  • Tables and indexes that are mostly READ or READ-ONLY and infrequently modified.

The following criteria must also be considered for separating database objects into tablespaces:

  • Tables should be separated from indexes.

  • Assign read-only tables to READ-ONLY tablespaces.

  • Group smaller reference tables in the same tablespace.

Using this strategy to group objects into tablespaces will improve the performance of Oracle's dynamic resource mastering. Oracle’s "dynamic resource re-mastering by datafiles" algorithm re-distributes GCS resources to the instance where they are needed most. This re-mastering strategy is designed to improve resource operation’s efficiency. Oracle re-masters cache blocks to the instance with which the cache blocks are most closely associated based on historical access patterns. As a result, resource operations, after re-mastering, require minimal communication with remote instances through the GES and GCS.

Extent Management and Locally Managed Tablespaces

Allocating and de-allocating extents are expensive operations that should be minimized. Most of these operations in Real Application Clusters require inter-instance coordination. Keep in mind that a high rate of extent management operations can adversely affect performance in Real Application Clusters environments more than in single instance environments. This is especially true for dictionary-managed tablespaces.


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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