2 tier and 3 tier

what is 2tier archiyecture and 3 tier and difference between them?
please give me solution for this ..

You can check these link to have more knowledge:
http://en.wikipedia.org/wiki/Client-server_architecture for 2 tier
http://en.wikipedia.org/wiki/Multitier_architecture for 3 or more tier
http://www.virtu-software.com/ask-doug/QandA.asp?q=48 to compare
Thanks,
Gordon

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Differcence between 2-tier and 3-tier

hiii,
diff between 2-tier and 3-tier sap architecture??

The easiest way to explain this is, as you suggest, by an example. So I'll give you an example.
Let's suppose I'm going to write a piece of software that students at a school can use to find out what their current grade is in all their classes. I structure the program so that a database of grades resides on the server, and the application resides on the client (the computer the student is physically interacting with).
When the student wants to know his grades, he manipulates my program (by clicking buttons, menu options, etc). The program fires off a query to the database, and the database responds with all the student's grades. Now my application uses all this data to calculate the student's grade, and displays it for him.
This is an example of a 2-tier architecture. The two tiers are:
1. Data server: the database serves up data based on SQL queries submitted by the application.
2. Client application: the application on the client computer consumes the data and presents it in a readable format to the student.
Now, this architecture is fine, if you've got a school with 50 students. But suppose the school has 10,000 students. Now we've got a problem. Why?
Because every time a student queries the client application, the data server has to serve up large queries for the client application to manipulate. This is an enormous drain on network resources.
So what do we do? We create a 3-tier architecture by inserting another program at the server level. We call this the server application. Now the client application no longer directly queries the database; it queries the server application, which in turn queries the data server.
What is the advantage to this? Well, now when the student wants to know his final grade, the following happens:
1. The student asks the client application.
2. The client application asks the server application.
3. The server application queries the data server.
4. The data server serves up a recordset with all the student's grades.
5. The server application does all the calculations to determine the grade.
6. The server application serves up the final grade to the client application.
7. The client application displays the final grade for the student.
It's a much longer process on paper, but in reality it's much faster. Why? Notice step 6. Instead of serving up an entire recordset of grades, which has to be passed over a network, the server application is serving up a single number, which is a tiny amount of network traffic in comparison.
There are other advantages to the 3-tier architecture, but that at least gives you a general idea of how it works.
Incidentally, this website is a 3-tier application. The client application is your web browser. The server application is the ASP code which queries the database (the third tier) for the question-and-answer you requested.
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Hello,
I think u are mixing some things here.
In order to apply 5983622, u have to update database version is 10.1.0.4 to 10.1.0.5. (patch 4505133) That must be done before patching the two homes of Application Server.
Patch 5983622 is for Application Server. U have to apply it on Infrastructure Tier and on Application/Mid tier Home, in order to update Application Server from 10.1.2.2 to 10.1.2.3.
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If you just want to see which midtier is bound to which infrastructure you can check $ORACLE_HOME/config/ias.properties . This doesn't explain how communication works though.
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Ok this may be easier if I list the requirements of each mode
full deski client install is required by both 3-tier and 2-tier
Connectivity to the CMS (6400 by default) and direct connectivity to the reporting DB(middleware installed on the client machines) is required by 2-tier
2 tier workflow
launch busobj.exe on client
system has CMS name in it and optional port#
login request is sent to CMS
to refresh reports (middleware must be set up locally on the client) such as SQL ODBC, Oracle, DB2, etc
Connectivity through a webserver (java:8080 or .net:80), connection server(service in the CCM/CMC that deski clients connect to) and DB connectivity(middleware installed on the server) set up on the enterprise server for 3-tier
3 tier workflow
launch busobj.exe on the client
system has globe icon and .net or j2ee (IIS or tomcat typically)
globe icon exists if .intranet file exists in C:\Documents and Settings\taz\My Documents\My Business Objects Documents\LocData on the client
file is created when preferences in infoview are set to launch desktop intelligence and a deski doc is accessed from infoview
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2 tier and 3 tier

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