Joshua Johnson <[log in to unmask]> wrote:

>If you are looking for simultaneous opens then maybe I can help. I just did
>a test to see how many opens the OS would handle before it ran out of
>resources. Check out these statistics:
>
>I had almost 3,000 jobs logged on.
>Each job opened 5 databases anywhere from 2 to 10 times. I kicked the jobs
>off in batches of a few hundred and passed a parameter using STREAMX telling
>the job how many times to open each database.
>I each database was opened a total of 6,461 times (listf ,3). So 5 databases
>time 6,461 opens per database is 32,305 opens. Then I ran out of DST table
>entries (I was running TBLMON and GLANCE).
>
>The program that opened the databases was a simple Cobol program that opened
>the databases then paused in a loop looking for a file OPENSTOP as a trigger
>to close the databases. As soon as I built that file the jobs fell out of
>the loop and logged off. This was not the best way to kick that many jobs
>off it took 6 hours just for the jobs to log off.
>
>The system used for this test was a 995/400 with 2GB of memory and 6 2GB FW
>drives on my system volume set. I also had the databases spread across three
>private volumes that were very large. The system has a total of about 230GB
>usable (it is mirrored).



Awesome!  It would be interesting to see how common non-HP3000 platforms
handle this with common non-MPE operating systems and common non-IMAGE
databases.

Don't forget to factor in the TOTAL COST OF OWNERSHIP of such common
approaches :-)
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