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Two vs. Three Tier Development

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Kevin

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Mar 6, 1998, 3:00:00 AM3/6/98
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We are in the process of developing a new product. We are trying to
decide whether to develop the product based upon a two vs. three tier
model. Most of the users will be local LAN users (98%). However, we
are looking to be able to provide the benefit of a multi-tier app to the
few that require remote communications for some users.

Here are our concerns:

1) For those companies that do not have a Midas server, or do not want
to use our application in a multi-server (tier) environment (98%+), will
the application suffer using a multi-tier structure in a two-tier
environment? In other words, since the client will be both the
thin-client and the remote server (not requiring a Midas license) will
this configuration be slower than a true C/S two-tier application not
using the multi-tier model?

2) If no, or minimal to #1, would there be a reason not to develop ALL
new applications using the multi-tier model in the event that some day
the application needs to be used in such a configuration?

3) If yes to #1 and #2, once you get the knack of it, is developing
multi-tier just as easy as two-tier C/S.

4) Since 98% plus of all workstations will not be using a middle-tier
server, how painful is the installation going to be for these
workstations since the middle-tier will be required to be installed on
the same machine?

5) Again, since the mass population is not going to require the
middle-tier server, are we going to add a support nightmere?

Sorry for all the questions, thanks in advance if you take the time to
respond!!

Kevin

Josh Dahlby

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Mar 9, 1998, 3:00:00 AM3/9/98
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>1) For those companies that do not have a Midas server, or do not want
>to use our application in a multi-server (tier) environment (98%+), will
>the application suffer using a multi-tier structure in a two-tier
>environment? In other words, since the client will be both the
>thin-client and the remote server (not requiring a Midas license) will
>this configuration be slower than a true C/S two-tier application not
>using the multi-tier model?


This really depends on what the client does with the data. The startup of
the application will be slower, but once started, all operations are very
fast since all data is in memory.

>2) If no, or minimal to #1, would there be a reason not to develop ALL
>new applications using the multi-tier model in the event that some day
>the application needs to be used in such a configuration?


It really depends on the application. If you require very large amounts of
data, then you will still have to do 2-tier developement.

>3) If yes to #1 and #2, once you get the knack of it, is developing
>multi-tier just as easy as two-tier C/S.


Well, I'd say yes, but really once you get the "knack" of something, it is
normally easy. Right?

>4) Since 98% plus of all workstations will not be using a middle-tier
>server, how painful is the installation going to be for these
>workstations since the middle-tier will be required to be installed on
>the same machine?


Shouldn't be much harder than if it was a 2-tier installation.

>5) Again, since the mass population is not going to require the
>middle-tier server, are we going to add a support nightmere?


I don't think so.

Josh

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