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                                     I became the teacher of my teacher

              This conversation between two friends who have joined MBA in different colleges and taking on phone about their daily routine

ME:: hey amulya how was day??

Amulya:: hey sri was bad

ME:: why what happened is everything alright??

Amulya:: hmmm no I am sick ...iam suffering with severe headache and did not attend classess today which inncluded MIS which is very important

ME:: Thats odont worry will teach u I am done with almost 3 classess as of now so i think i can explain MIS to you

Amulya:: Hey thats cool what more than that

ME::yeah anything for you amu .......ok firstly we would start with MS word right??

Amulya(sarcastically):: I guess i was the one who taught u as far as i remember!!

Me(ignoring the statement):: Now when you open a word document from your system its called single tier application.Because the data, i.e the word file and the application i.e Ms word 2010 are residing in the same system that is your personal computer. Are you with me? anyways who cares, i'm gonna continue ;)

Me: Now let me move on to 2 tier applications, before that let me ask you a question.

Say you are going to a multiplex to watch a movie. You stood in the counter 1 and got a ticket with seat number A12.Now if you immediately go to counter 3 (which issues ticket for the same movie and same time) is there any chance of you getting another A12 ticket??? or is there any other chance of any one else getting the seat number?

Amulya::Stop giving silly examples and go a head

ME::Me: Rite, Now that 'some kinda setup' is what we call 2 tier architecture. Because the data, i.e the seats available/blocked/booked will be a central data common to all counters and the application they use to book tickets and take print etc would reside in their own computer. Because the data source ie the data server is central there is no case of data integrity. Very easy isnt it.

Amulya:: yeah i get it now its easy

ME::Awesome. Now i'll move on to 3 tier architecture. In 2 tier architecture all the processing of data are done in client application software, so obviously there were issues in transmitting data to another terminal. To oversome this we introduced some thing called 'Application servers'. These servers will pull data from central box, do all the processing and then give the final output to the thin client application. Now we'll move into multi tier applications.

Amulya:: oh its interesting so is it some thing like booking tickets online is it??

ME::exactly Now thats the concept of multi tier applications. We introduce some thing called 'web servers'. Why so? Because our browsers cant interact with application servers directly, so we need a web server to do that. And thats almost the end of tiered architecture.

Amulya:: oh!! thats great its easy thanks darling u made it easy for me now i can go do my assignments:)

ME:: hey stop being so formal .....any thing for u swthrt:)

Amulay::heheh yeah thanks da chalo its dinner time catch u later:)

ME:: yup sure and take care of your health:) bye