A QVD (Qlik View Data) file is a file containing a table of data exported from Qlik View. QVD is a native Qlik View format and can be written to and read by Qlik View. The file format is optimized for speed when read data from a Qlik view but it is still very compact reading data from Qlikview file is typically 10-100 times faster than reading from other data sources.
A QVD File holds exactly one data table and commits 3 parts
1. A Well formed XML header describing the fields in the table the layout of the sub sequent information and some other meta data.
2. Symbol table in a byte stuffed format
3. Actual table data in a bit stuffed format
Ex. Store * from categories into pathcategories.qvd(qvd) A QVD consists of layout, script, Data, Data model