January 2016
Beginner to intermediate
166 pages
3h 18m
English
Content preview from QlikView EssentialsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.