Overview of Data files (QVD) in QlikView

Last updated on Nov 01 2021
Harshal Shah

Table of Contents

Overview of Data files (QVD) in QlikView

One of the important features of QlikView, which makes it so distinguished is the ability to store very large amount of data in a very compressed size and store it along with the QlikView documents. Therefore, once the document is created we need not connect to the data source, as the data is already stored along with the layout of the document. This is achieved through QVD file, which is a flat file stored with the .qvd extension. A QVD file stores data for one QlikView document and it is created using the script editor available in the QlikView document.

Advantages of Using QVD Files

The advantages of using QVD files in QlikView are as follows −

  • Faster Loading of Data
  • Gracefully support scaling up as the data volume grows
  • Used in incremental load
  • Data from multiple sources can be clubbed to one data set
  • Extract data in parallel

Creating QVD Files

QVD files are created using the STORE statement during the loading of QlikView files. This statement creates a single qvd file, which gets stored in the specified location as a file; separate than the QVW file through which it is created.

Given below is an example of storing the qvd file after the data is loaded into the QlikView document by reading a source file.

image1 19

Using QVD Files

A QVD file is loaded to a QlikView document in a similar way as other files like CSV, Excel and delimited files are used. We use the the Open option available under the File menu and browse for the QVD file we created before. On opening it gives us a window to see the data, select the column headers and do any data transformation required

image2 16

QVD File Loader Script

On clicking Finish, the edit script window appears which shows the code used to load the QVD file. We can edit this code further. For example, to get only the few of the columns to be displayed or apply any inbuilt function etc. Click finish to load the file into the current QlikView document. Save the QlikView document as use_qvd.qvw.

image3 13

Displaying Data from QVD File

Reload the document by using Control+R and choose the menu option Layout → New Sheet Objects → Table Box. A window appears showing all the columns from the table present in the QVD file. Select “Add All” to add all the columns to the display table. Use the “Promote/Demote” option to change the order of the columns. Click “Finish”. The following screen appears showing the content of the QVD file.

image4 12

So, this brings us to the end of blog. This Tecklearn ‘Overview of Data files (QVD) in QlikView’ blog helps you with commonly asked questions if you are looking out for a job in QlikView BI. If you wish to learn QlikView and build a career in Business Intelligence domain, then check out our interactive, QlikView Certification Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

https://www.tecklearn.com/course/qlik-view-certification-training/

QlikView Certification Training

About the Course

Tecklearn’s QlikView Certification Training will help you become an expert in Data Visualization with QlikView. Learn all the basics and advanced features of QlikView such as data modelling, reports and dashboards, visualization, object formatting, system table etc. Along with this, you will be given hands-on working experience on real-time projects that will help you pass the QlikView certification exam. You also get hands-on experience in QlikView applications.

Why Should you take QlikView Training?

  • The average annual pay for a QlikView Professional is $122,000. -PayScale.com.
  • Deloitte, Cisco, Qualcomm, Sony, AON & other top Fortune 500 companies use QlikView
  • QlikView – A Leader in 2017 Gartner Magic Quadrant for Business Intelligence & Analytics Platforms (For 7th Consecutive Year)

What you will Learn in this Course?

Introduction to QlikView

  • Concept of Business Intelligence
  • Features and components of QlikView
  • Comparison with other BI tools
  • Architecture
  • Installation & Navigation
  • QVS, QVW and .log files
  • Sheet Objects
  • Dimensions and Expressions
  • Various file types and extensions

Various QlikView Products

  • Overview of the various QlikView products

Introduction to Data and Scripting

  • Structuring the Script
  • Create tabs in the scripts, Debugging of scripts
  • Hands On

Data Model

  • QlikView Data File Types: QVD, QVX
  • System fields
  • Star schema
  • Synthetic Key Tables
  • Data Modelling Considerations
  • Straight and Pivot Table
  • Hands On

Components of Qlik View

  • Sheets and Sheet Objects
  • The List Box
  • The Table Box
  • The Multi Box
  • The Button & Text Object
  • Basic Charts
  • Hands On

Set Analysis

  • Set analysis
  • Working with modifiers, identifiers, operators, example of expressions,
  • Indirect set analysis
  • YTD & MTD

QlikView Functions, Reports and Charts

  • Uses of Expressions
  • Chart Properties: Dimensions
  • Qlikview Functions
  • Adhoc Reports
  • Incremental Load using QVD Files
  • Bookmarks
  • Hands On

Data Analysis

  • What-if Analysis
  • Comparative Analysis
  • Dynamic Reporting or Ad-hoc Reporting
  • Document Analyzer

QlikView Security

  • QlikView security
  • Defining the access controls and levels of access
  • Maintaining the access control database

QlikView Administration

  • QMC (QlikView Management Console)
  • Server Installation & Deployment
  • QlikView Project

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