Saat ini saya bekerja dengan SAP. Mengenai 3 tier bisa saya jelaskan sebagai 
berikut:
- DB (single). --> Database untuk menyimpan data, program, user master dll.

- Application (many). --> Tempat di mana suatu job (proses) berjalan. Di SAP 
dikenal dengan DVEBMGS (Dialog Update(V) Enqueue Batchjob(background job) 
Message_server Gateway Spool). Jumlah tiap komponen variatif. Konfigurasi 
lengkap DVEBMGS terdapat pada Central Instance, yaitu main application 
server. Kalau kita menginstall application server yang lain, bisa saja hanya 
mengkonfigur D, DS, etc. Tapi minimal harus ada 1 D dalam tiap application 
server.

- Presentation (many). --> User interface, berupa SAPGUI atau Internet 
Explorer (kalau menggunakan Enterprise Portal atau Internet Transaction 
Server).


Regards,

Agoes BP


----- Original Message ----- 
From: "jmzboy" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, December 29, 2006 9:29 AM
Subject: Re: [ITCENTER] Aplikasi Two Tier dan Tree Tier ??


> Agoes Boedi Poerwanto wrote:
>
>> Three tier terdiri dari 3 layer:
>>  - DB (single).
>>  - Application (many).
>>  - Presentation (many).
>
> Bisa dijelaskan masing2 point ini Pak Agoes?
>
> --
> Jamal
> 



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