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Topic: B4-IT Two-tier, Three-tier Architecture (

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NJD30
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Posted: 03 Jul 2009 at 12:43 \| IP Logged

On Becker page B4-30 there are examples of Two-tier
Architecture and Three-tier Architecture, can some one
please explain this...

Thanks a lot

jay_usa
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Posted: 07 Jul 2009 at 23:15 \| IP Logged

NJD30

3 basic terms you need to know to understand 3 tier architechture. Most ERP systems are 3 tier systems.

1 ) Presentation -The applications/systems which you can see on your desktop.. For example Microsoft Excel

2) Application : Once you enter the transactions and submit post, application systems generates a document number or asset number or vendor number etc..How does this happen ? Because application servers are designed to do this.

3) Database : Once application generates a document or asset number, where does system is going to store this ? In Database server..e.g Oracle.

Hope this helps.

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Jay CPA,CGMA,CITP,MBA

NJD30
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Posted: 08 Jul 2009 at 10:18 \| IP Logged

Thanks Jay!

Dparkx81
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Posted: 12 Jul 2009 at 11:45 \| IP Logged

So for two tier, which one is taken out? THanks

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jay_usa
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Posted: 12 Jul 2009 at 13:06 \| IP Logged

In two tier systems, there is no application server.. The client/workstation/presentation systems directly deal with the Database server..which is not very efficient. It can be only used for small number of users. Because every time a user queries the client application, database will have large queries to do for the client.

For that reason, we need 3 tier architechture, where the client makes the query, application server processes and then database server will provide the query. And this can be used for large number of users.

Hope that helps.

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Thanks
Jay CPA,CGMA,CITP,MBA

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