Book Image

QlikView Essentials

By : Chandraish Sinha
Book Image

QlikView Essentials

By: Chandraish Sinha

Overview of this book

This guide demonstrates just how easy it is to get started with QlikView and create your own BI application. Featuring an introduction to its core features before exploring how to load data and model it, you’ll soon become more confident that you can take full advantage of QlikView’s capabilities.. You will also learn how to use QVD files with QlikView – and how they offer a simpler way of handling data. After digging deeper into data handling, as you learn how to use mapping tables and create a master calendar, you’ll then find out how to get the most from QlikView’s visualization features – vital if you are to use your data insights effectively. From accessible and user friendly dashboards to strategies and best practices for subjecting data to further analysis, you can be confident that you’ll be prepared to get the most out of your data with QlikView. With details on how to finally secure your application and deploy it for a successful integration in your organization, QlikView Essentials underlines exactly why QlikView is becoming more and more popular for businesses that understand the value of data.
Table of Contents (15 chapters)
QlikView Essentials
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

QlikView Data Files (QVD)


A QVD file is a very important feature in QlikView. It is a file containing a table of data exported from QlikView:

  • QVD is a native QlikView format, meaning it can be read/write only from QlikView.

  • Reading data from a QVD file is typically 10-100 times faster than reading from other data sources. It reduces the load on the database as QVDs can be loaded once and used multiple times without connecting to the database.

  • QVD files can be shared easily among different applications.

  • QVD files can combine data from multiple QlikView documents.

  • An incremental load is implemented using QVD files.

  • A QVD file consists of:

    • A well-formed XML header

    • Symbol tables in a byte stuffed format

    • Actual tables of data in a bit stuffed format

  • QVD is created by using a STORE command.

Creating QVD files for our data model

We will store all the tables in the QVD files so that data read and write is faster:

  1. Open QlikViewEssentials_Chap4_IntervalMatch.qvw and save as QlikViewEssentials_Chap4_QVDCreator...