What is QVD

[Anonymous]

What is QVD in Qlikview and how it works?

i know the syntax for how to create it but i want to why ,when and where it is used ?

Thank you

Best

Prachi

[avinashelite]

QVD : Stands for Qlikview Data (One of the optimize layer of data which has been fetched from the database, qvd is a patent technology of qliktech and qlikview applications reads data 100 time faster as compared to any other sources because data get stores in optimized format. Only Qlikvew application can read the data from QVD. Its always better to fetch the data from from database first and then load the data into your application)

STORE table_name into path\qvd_name.qvd(QVD);

[MK_QSL]

qvd

https://help.qlik.com/en-US/sense/3.0/Subsystems/Hub/Content/Scripting/work-with-QVD-files.htm

[sasiparupudi1]

one example is to use qvd's for incremental loads

1 QVD can store 1 table . The read from the qvd can be upto 100 times faster than any other data source reads provided it is read in Optimized load.

In a ETL Process,

The extract qvw can extract the data from your data sources and store each table data into a qvd file.

the transform qvw file can use the qvd from the extractors and transaform the data and store the transformed table data into another set of qvd's.

The UI can just load   the transformed qvd

hth

[ramasaisaksoft · Accepted solution]

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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[Anonymous]

Thank you everyone for your better explanation ,now my doubt is cleared.

[yvenkatesh219]

QVD: It is nothing but what the raw we got from database we can use that data into knowledge that data we can import to QlikView script through will the help of providers are

OLEDB,ODBC

Then we can load that Tables into script then store that table data as QVD

Syntax:store Table name into/path/filename.qvd(qvd);

If once we create a QVD then no need to connect database everytime, File loading is faster 100:10 by using QVD. If the data get updated need to update.

Date base:10%

QVD:100%

Here,another way to load data like QVD it is named as Buffer load we can get file from Here also.

Thanks

Venkatesh