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DBMS_AQ

Posted on 2013-11-10
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Can anyone explain me the use of DBMS_AQ in simple terms?
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Question by:sakthikumar
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LVL 23

Expert Comment

by:David
ID: 39637708
With tongue in cheek, that's like getting a simple explanation of the U.S. Government....

Since Oracle 8i (I think), there has been a native method to send and receive messages between the database and outside services.  In 10g, Oracle Streams is the Advanced Queueing (AQ) solution.

In PL/SQL, the DBMS_DQ package bundles the common enqueing and dequeing services for the messaging.

There's little in the E-E KB to offer you; I found http://www.oracle-developer.net/display.php?id=411 to be useful, and as always, there's the Oracle documention: http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_aq.htm
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Author Comment

by:sakthikumar
ID: 39637982
What kind of messages and how it is transferred, can you give a simple example.

Because you know oracle has procedures, functions etc., that can give information when called. how this is going to be different.?
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David earned 2000 total points
ID: 39641548
<Grins> You've picked one of the more difficult features (to me) in Oracle -- in 20 years I've never been on a site that's used this.  Other experts are more than welcome to weigh in.

Your PL/SQL "information" is predominantly internal to the database instance.  A procedure might use dbms_output to put lines on SYSOUT -- or simply echo short messages to the log for debugging.

Streams and AQ refer to message strings sent out of, and in to, the Oracle instance.  In the source following, an example is to pass a string to a Java program.

http://www.idevelopment.info/data/Oracle/DBA_tips/Advanced_Queuing/AQ_2.shtml
and
http://docs.oracle.com/cd/B19306_01/server.102/b14229/strms_over.htm#CHDGDGDI
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Author Comment

by:sakthikumar
ID: 39647592
Second link is really good, I can understand well.
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Author Closing Comment

by:sakthikumar
ID: 39647607
Thanks dvz good articles.
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