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If one node fails,
the surviving nodes provide continued access to the database. Grid computing
deployment further extends availability capabilities.
Oracle Database 11g provides a number of high availability enhancements, including
the ability to easily capture diagnostic information about database failures. For a
more detailed discussion of high availability, see Chapter 11.
Oracle Streams and Advanced Queuing
Messaging technology has existed for quite some time and is common in OLTP
applications. Typical messaging technologies provide a reliable transport layer for
shipping messages from one machine to another over a network. Oracle8 introduced
Advanced Queuing (AQ) as an integrated database service. Oracle9i Release 2 combined
AQ with log-based replication in the creation of Oracle Streams.
Oracle Streams AQ provides the benefits of simple messaging products but adds the
value of database-resident queues. The information in message queues represents
critical business events and should be stored in a reliable, scalable, secure, and recoverable
place.


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