Advanced Queuing - Oracle

Dequeue enhancements: Using the dequeue with a condition functionality,
subscribers can select messages that satisfy a specified condition from the
messages meant for them.
Overall performance improvements: AQ exhibits overall performance
improvements as a result of code optimization and other changes.
Propagation enhancements: The maximum number of job queue processes has
been increased from 36 to 1000 in Oracle9i. With Internet propagation, you can
set up propagation between queues over HTTP. Overall performance
improvements have been made in propagation due to design changes in the
propagation algorithm.
JMS Enhancements
All the new Oracle9i features are supported through JMS, as well as the
following:
Connection pooling: Using this feature, a pool of connection can be
established with the Oracle database server. Later, at the time of
establishing a JMS session, a connection from the pool can be picked up.
Global topics: This is the result of the integration with Oracle Internet
Directory. AQ Queue information can be stored and looked up from OID.
Topic browsing: Allows durable subscribers to browse through the
messages in a publish-subscribe (topic) destination, and optionally allows
these subscribers to purge the browsed messages (so that they are no longer
retained by AQ for that subscriber).
Exception listener support: This allows a client to be asynchronously
notified of a problem. Some connections only consume messages, so they
have no other way to learn that their connection has failed.
Oracle8i New Features in Advanced Queuing
The Oracle8i release included the following Advanced Queuing features:
Queue-level access control
Nonpersistent queues
Support for Oracle Parallel Server
Rule-based subscribers for publish-subscribe
Asynchronous notification
xli