Re: How to use DataQues with RPG ?

["Scott Bradley-Robbins" <BradleSD@xxxxxxxxxxx>]

There are several advantages to data queues.  I have processes that have 
multiple  programs reading from a single data queue.  If one program has picked 
up an entry from the data queue and is processing it, the next program waiting 
on the data queue picks up the next message.  Sort of a multi-process process.  
Each program performs the same function, but depending on the number of events 
waiting on the data queues for a given site, there might be more processes 
running reading the data queues.

Another advantage is that you can have keyed data queues.  In my processes, I 
have different types of programs reading from the same data queue.  An entry is 
keyed to a specific type of program.  Only that type of program reads that 
entry from the data queue.

You can also create remote or DDM data queues if you have multiple systems.  
They run slower, but it is a way to move small amounts of data between programs 
on different systems.

Keep in mind though, that the data queue object continues to grow in size even 
when the entries are removed from the data queue.  Periodically, they must be 
recreated.

Those are my rambling thoughts on data queues...

Scott Bradley-Robbins
bradlesd@rsvl.ah.org

>>> Jocke Berggren <jocke@fsys.se> 09/23/99 12:12AM >>>
How do I use DTAQ's between two RPG programs to exchange data ?

Today we use a physical file with the write, read, delete method.

Can't find anything about DTAQ's in the RPG IV manuals.....

Whats the benefit of using DTAQ's anyway ?




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