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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Creating Efficient RAC Data Objects

  • Use data fillers. For example, CHAR data types can be used to artificially extend the size of a data row, thus reducing RPB.

Other techniques to improve the efficiency of data objects include:

  • Use as few indexes as possible to optimize data retrieval from the RAC data objects. Index node contention is the largest source of intra-node block pings (or as Oracle calls them, intra-instance block transfers.) Index maintenance causes a great deal of intra-node pinging. 

  • Use automated freelist management.

  • For high insert objects, pre-allocate extents to avoid dynamic space management. Assign allocated extents to specific instances. This avoids intra-instance block transfers during insert activity from multiple nodes. For example:

ALTER TABLE
   ad_proofs
ALLOCATE EXTENT ( SIZE 200K
DATAFILE ’/usr/u01/oradata/addb/ad_file3.dbf’
INSTANCE 2);

  • Use locally managed tablespaces to avoid uet$ and fet$ block pinging between instances.

  • Use reverse-key indexes for indexes that may become right-hand indexes due to high insert rates. (Note: This removes the capability to use index scans. Use only when required.)

  • Design indexes such that the clustering factor is as close to the number of used blocks as is possible. Testing various column orders in concatenated indexes does this. In single column indexes required for SQL optimization, consider re-ordering the table in index order to reduce clustering factor. (Note: This technique can result in hot blocks and is the reverse of the previous suggestion to use reverse-key indexes, which actually increases the clustering factor.)


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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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
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  • 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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