Advanced Queuing - Oracle

Performance Questions
How do I use agent information stored in an OID?
You can create aliases for an AQ agent in OID. These aliases can be specified while
performing AQ operations-enqueue, dequeue, and notifications. This is specifically
useful while performing AQ operations over the Internet when you do not want to
expose an internal agent name. An alias can be used in an AQ operation (IDAP
request).
Transformation Questions
Performance Questions
What happens to enqueue, dequeue, or propagation if the
transformation mapping raises an error?
Enqueue and dequeue of the message will raise the error to the application. If the
error occurs during the dequeue operation, the retry count of the message is
incremented. If the retry count exceeds max_retries, the message is moved to
the exception queue. If the error occurs during propagation, it is handled in a
manner similar to dequeue; propagation of the message will fail. It will be
attempted again and the message will be moved to the exception queue when retry
count exceeds max_retries for the queue.
How do you do transformation of XML data?
Transformation of XML data can be done in one of the following ways:
Using the extract operator supported on XMLType to return an object of
XMLType after applying the supplied XPath expression.
Creating a PL/SQL function that transforms the XMLType object by applying an
XSLT transformation to it, using the package XSLPROCESSOR.
What is the maximum number of queues that a table can have without
affecting performance?
Performance is not affected by the number of queues in a table.
When messages are moved from one queue to another using
propagation, is there any optimization to move the messages in batches,
rather than one at a time?
Yes, if it is optimized, propagation happens in batches.
Frequently Asked Questions 6-19