We have an mv (Unidata) application that we need to move to Windows (GUI) environment. We are also interested in deploying this application on many of our clients/vendors systems.

I am in the process of looking at my options as this application is very heavy on I/O. Users generate hundreds of reports daily as the data is date and time sensitive.

Questions:

1. Can OI handles 100+ users accessing the database simultaneously?

2. Are OI hash tables stable and can it handle large volumes of data?

3. How is the I/O performance on their hash tables, B-trees and do you get a lot of GFE?s?

4. Are there large size applications created with OI?

5. What is the learning curve to use this environment and be productive?

6. Any other resources that I can review to familiarize myself with this environment.

Thank you,

dannya@williamsworldwide.com

Danny

We moved from Unidata about 5 years ago.

1. We have not had experience in this number of users.

Maximum of about 25, but provided you have the NT service or NLM there is potentially no limit. AS the workstation PC does a reasonable amount of work the server is not given as much stress as Unidata using terminals, and provided you have a decent server it should be fine. We may have a 100 user coming up though.

2. Files are stable but the NT service/NLM is a must.

I heard there was a problem with files of 64k modulo (pretty big) but this was resolved a release or two ago.

Problem exists with 64k variable and record limit, which is a nuisace if you are coming from Unidata, but there are ways and means to resolve.

3. Performance is fine, again with NT service/NLM, again erasonable hardware is needed as Windows is a bit heavy, and a good network.

Hashing is essentially identical to Unidata.

GFEs do exist, but again with NT Service/NLM much reduced.

I have been developing for 5 years and have only had one or two that I can remember, but users get them frequently without NT Service/NLM.

Coding practice also can reduce.

4. Our apps have about 300 screens, with about 100 tables.

There is mention in this forum of a very large application.

5. The learning curve is quite short as the code is essentially the same as Unidata Basic. The only thing you need to get your head around is event handling and controls/properties.

There is a totally different concept to progrmaming in Windows than to procedural systems, but it is much more productive and great fun too.

6. Look around this forum.

Worth getting the 'Works' for upgrades and support etc.

If your reports are important (as mentioned) then make time to investigate and decide between Revelations Reporter, or Tony Splavers OIPI or both. Reporter has improved immensely since the early days, but for overall control OIPI is great, but this is only my opinion.

Hope this help…

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