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Hi frnds...
why we r using 3-tier architecture in qlikview....why we didn't use 4-tier architecture for qlikview whts the reason pls give answer fast....
Well, you are not forced to use any specific n-tier architecture. Just use what is appropriate for your setting and requirements.
Increased performance: QVD file makes the transform to load the data 100 times faster than loading it from the database.
Flexibility: More flexible since it used binary load in presentation layer, so the transform can be used in many dashboard.
Easy to maintain: We do separate the qvd generator files for each data source for east to maintenance. Since if one of them doesn't work it’s easier to pinpoint as well as u don’t have to take down all data sources while fixing it.
Re usability: QVD and transform files can be used in many applications.
I often find the The Feynman Problem Solving Algorithm useful. It may sound somewhat fastidious, but I often find the first step very useful - so write down the "problem" :
After that read what you have written down, think about your problem and hopefully you should be able to decide then on the solution that solves you problem.