QVD is a type of file to understand the data format for Qlikview software.
QVD will follow the compression technique so it will reduce the data 95% when compared with the table data in Database.
WHY:- It is helpful to fetch the data in a super fast manner(Why because it is understandable format for Qlikview ex:- it is a Mother tongue Language for Qlikview)
when :- If we fetch data from data base depends on the n/w speed data retrieving and calculation time it will take time so it will reduce that and increase the speed of Data Refreshment time for the EndUser
where :-we will use QVD's at the time of Incremental load time.
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