Difference between ODBC and OLEDB in Qlikview

in one bite :: we commonly used functionality in qv while connect to db. here is the issue we know all of us use OLEDB why it is Preferable here i go with simple words...


ODBC : we can use this and access only relational database's such as oracle,mysql, mssql like,,
using we can't access old databases.

OLEDB : it's combination of Relational and non relational database's
it means the databases like XML,Mongo DB ,, (not only these)

Here look at Image for clear expo   Image  source

   

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what is QVD and why

QVD stands for QlikView Document ( Data ) 

- QlikView Compressed Database File it is a flat data file with the extension .qvd. It saves an uncompressed RAM image representation of a QlikView table as it was stored in memory when open in QlikView, The applications reads data 100 time faster as compared to any other sources.

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