Advanced Queuing - Oracle

General Questions
2 - Ex subscriber - A subscriber that unsubscribed but had agent entries in the
history aq$_queuetable_h IOT.
4 - Address - Used to store addresses of recipients. The name is always NULL. The
address is always non-NULL.
8 - Proxy for Propagation - The name is always NULL.
database proxy to local queues, address=NULL, protocol=0
database proxy to remote queues, address=dblink address, protocol=0
3rd party proxies, address = NULL, protocol = 3rd party protocol.
After a message has been moved to an exception queue, is there a way,
using SQL or otherwise, of identifying which queue the message
resided in before moving to the exception queue?
No, AQ does not provide this information. To get around this, the application could
save this information in the message.
What is the order in which messages are dequeued if many messages
are enqueued in the same second?
When the enq_time is the same for messages, there is another field called step_no
that will be monotonically increasing (for each message that has the same enq_
time). Hence this helps in maintaining the order of the messages. There will be no
situation when both enq_time and step_no are the same for more than one
message enqueued from the same session.
What happened to OMB? When should we use AQ and when should we
use Oracle MessageBroker?
In Oracle9i, OMB functionality is provided in the Oracle database. So, if you are
using the Oracle9i database, use the functionality offered by the database.
You do not need OMB.
With Oracle8i, use OMB in the following scenarios:
To integrate with MQ Series
To use HTTP framework
Use JMS functionality directly from the database in other scenarios.
Frequently Asked Questions 6-5