Re: This is a software design question - ILE related

["Al Barsa, Jr." <barsa2@xxxxxxx>]

At 10:55 AM 8/2/00 +1000, you wrote:

Hi,

Yes.  I acknowledge that I was wrong.  I had never heard of the AUTORCL 
parameter, which is a testimony as to how well IBM communicates functional 
enhancements to OS/400.

Al


>h
>Hello Al,
>
>You wrote:
> >With all due respect, I believe that this information is not correct.  They
> >must be periodically deleted and re-created.
>
>With an equal amount of respect -- you're wrong.  Queues reuse the 
>existing space
>however they do not RECLAIM existing space.  For example, if an 
>application writes 100
>entries to a queue and those entries are processed and removed the queue 
>will occupy
>storage for 100 entries (plus object overhead).  If the application then 
>writes 50
>entries to the queue they reuse the existing space.  The queue still 
>occupies 100
>entries worth of space.  Assume those 50 entries are processed and 
>removed.  The queue
>still occupies 100 entries space.  Now assume a serious increase in 
>activity and the
>sending application writes 125782 entries to the queue.  The queue is now 
>using a
>potentially large amount of DASD.  Processing and removing the entries 
>doesn't RECLAIM
>the space but the queue will not increase in size until it contains more 
>than 125782
>entries.  If the normal number of entries on the queue is 75 then the 
>queue is wasting
>DASD and the only way to reclaim that space is to delete and recreate the 
>queue.
>
>There is no need to delete and recreate queues in a properly designed 
>system.  As the
>senders increase the entries the receiver starts more processes to handle 
>the load.  As
>the load decreases the receivers shut themselves down.  Simple!
>
>Regards,
>Simon Coulter.
>
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