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Donald K. Burleson

Oracle Tips  

Oracle Database Distribution

* Failure at one node is less likely to affect other nodes. The global system is at least partially available as long as a single node of the database is active. No single failure will halt all processing or be a performance bottleneck. For example, if the Pittsburgh node goes down, it won’t affect the Omaha node, as long as Omaha doesn’t require any of Pittsburgh’s data.

* Failure recovery is on a per-node basis.

* A data dictionary exists for each local database.

* Nodes can upgrade software independently, within reason.

As DBA you will need to understand the structures and limits of the
distributed environment if you are required to maintain a distributed environment. The features of a two-phase commit, as well as naming resolution and the other distributed topics, will be covered in Chapter 14. Figure 1.3 shows a distributed database structure.

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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