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Oracle10g Grid Computing with RAC
Chapter 17 -
Oracle’s Grid Integration Technologies

Oracle Streams 

Thus, the Streams Methodology allows users to enqueue messages, propagate messages to subscribing queues, and dequeue messages. When the Streams method is utilized for data replication, it captures the DML and DDL changes made to the database objects and then replicates those changes to one or more destination databases, the so called consumers or subscribers.

When applied to the event management and notification mechanism, the Streams Methodology provides a powerful communication infrastructure. Applications can enqueue an event explicitly or a database event can be captured implicitly. Such events, being dequeued at a destination environment, may very well serve as a notification mechanism.  For instance, events pushed to a queue may be dequeued by a messaging application and then used to generate e-mail notification or a wireless message, based on the type of event content.

Maintaining a data warehouse involves periodic data refreshing and summarizing or analyzing loads of data. Operational data is fed into a data warehouse by a typical ETL (Extract, Transform, and Load) mechanism.

Streams-based feed mechanisms can capture the necessary data changes from the operational database and send it to the destination data warehouse. The use of redo information by the Streams capture process avoids unnecessary overhead on the production database. As the apply process allows transformation or selection of data at the consumer end, data loading gets additional flexibility to reformat and update the data warehouses with the received information.

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
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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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