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Donald K. Burleson

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Oracle Optimal Flexible Architecture (OFA)


You may wish to add an additional directory layer if you will have multiple Oracle versions running at the same time. This additional layer includes the version level.
2. Separate groups of segments (data objects) with different behavior into different tablespaces.

* Separate groups of objects with different fragmentation characteristics in different tablespaces (e.g., don’t put data and rollback segments together).

* Separate groups of segments that will contend for disk resources in different tablespaces (e.g., don’t put data and indexes together).

* Separate groups of segments representing objects with differing behavioral characteristics in different tablespaces (e.g., don’t put tables that require daily backup in the same tablespace with ones that require yearly backup).

3. Maximize database reliability and performance by separating database components across different disk resources. A caveat for RAID environments: Consider spreading datafiles across multiple controller volume groups.

* Keep at least three active copies of a database control file on at least three different physical arrays.

* Use at least three groups of redo logs in Oracle. Isolate them to the greatest extent possible on hardware serving few or no files that will be active while the RDBMS (relational database management system) is in use. Shadow redo logs whenever possible.

* Separate tablespaces whose data will participate in disk resource contention across different physical disk resources. (You should also consider disk controller usage.)

This is an excerpt by Mike Ault’s book “Oracle Administration & Management”.  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.




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