1 Reply Latest reply: Dec 20, 2011 2:34 AM by Miguel Angel Baeyens de Arce RSS

    QVD files



      I was created a QVD files from a chart and save in my PC,Now if i want to update data to QVD files from my data base how it would be possibe


      As i am new to this area please tell me what are the advantages of using QVD files

      If we are working by using a QVW file it is enough or we need to make use of QVD file also





        • Re: QVD files
          Miguel Angel Baeyens de Arce

          Hi Faisal,


          There are a lot of good documents and white papers on why use the QVD files and how. In regards to your question, I'd do a two step load, like the following:


          // This loads the existing data in your QVD file
          LOAD *
          FROM File.qvd (qvd);
          // This loads today data and appends its records
          // to the table above
          CONCATENATE (Original) LOAD *;
          SQL SELECT *
          FROM Database
          WHERE Date = '20111220'; // Or whatever source or condition you use to get new records
          // Now both the old data and today data are stored into the same QVD, so tomorrow
          // the LOAD will be the same
          STORE Original INTO File.qvd (qvd); 


          Hope that helps.