2 Replies Latest reply: Jun 14, 2011 10:38 AM by Deepak Vadithala RSS

    Structure of datasorce.qvd


           I am new to qlikview.I am identifying the datasource. qvd.Can anyone tell us that what is the structure of that file,as i am not able to identify.

      thanks and regards

        • Structure of datasorce.qvd

          QVD file has a native QV format. Only QlikView can read/write a QVD file.

          • Re: Structure of datasorce.qvd
            Deepak Vadithala

            QVD file contains exactly one table. Conceptually it is similar to any typed file (e.g. CSV). A QVD file is composed of three elements.


            1. A well formed XML header (in UTF-8 char set) describing the fields in the table, the layout of the subsequent information and some other meta data.


            2. Symbol tables in a byte stuffed format.


            3. Actual table data in a bit-stuffed format.


            QVD file format is optimized for speed when reading data from a QlikView script but is also very compact. According to QlikTech reading from QVD is 10-100 faster than reading from other data sources.


            Hope this answers your question!


            Cheers - DV