Oracle Database 10g Release 2 introduced the ability to use nonpersistent message
queuing for better performance in situations where there is not a need for the capabilities
provided by data-based queues.
Queue management through Oracle Enterprise Manager includes the following
capabilities:
??? Creating, dropping, starting, and stopping queues.
??? Adding and removing subscribers.
??? Scheduling message propagation from local to remote queues.
??? Displaying queue statistics, including the average queue length, the number of
messages in the wait state, the number of messages in the ready state, and the
number of expired messages.
Oracle9i introduced several new AQ capabilities:
??? XML-based messaging over HTTP enables support across firewalls; requests
may be through the XML-based Internet Document Access Protocol (iDAP).
??? AQ policies and services can be defined using Dynamic Services.
??? AQ agents can be defined in and managed through the Oracle Internet Directory
(OID).
Oracle9i (and beyond) AQ includes a built-in message transformation for PL/SQL
and XSLT.
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