Qlik Deployment Framework Sense Development Guide
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Qlik Deployment Framework
Qlik Sense Development Guide
February, 2017
qlik.com
Table of Contents
Development Guide v1.7.0
3
Why the need for a Development Guide?
3
Company Specific Development Guide
3
Platform strategy from a development perspective
3
Standards
4
Developing using QDF Containers
4
QDF Deploy Tool
4
Container Type Selector
4
Folder Naming Convention
5
Global Variables
6
Additional Variable Convention
7
Get started with Qlik Deployment Framework Containers
7
Initiate QDF in Qlik Sense
7
Linking (mount) Containers
7
Reuse of script code
8
Include files
8
Sub Functions
8
QlikView Components (QVC)
8
Pre-Defined Functions
9
Qlik Deployment Framework- Function Reference Guide
9
Data Modeling
10
Data models
11
Optimization strategy
14
Optimization Tips and Tricks
14
Other scripting best practices include:
15
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Development Guide v1.7.0
Using development best practices and guidelines is part of the Build and Validation phase in the Qlik
Application Development process, read more in Qlik Deployment Framework-Qlik Product Delivery
process.pdf
Why the need for a Development Guide?
The Developer Guide is a reference manual for Qlik developers. Qlik developers are individuals who design
and implement applications and their areas of expertise range from data modeling to scripting to UI design.
This document is designed to facilitate much clearer understanding of the methodologies and practices that
are optimal for producing highly usable, highly optimized and highly configurable Qlik applications, whether
used by small departments or by large enterprises.
Company Specific Development Guide
This document is a high level guide on how to develop using Qlik Deployment Framework and
predefinitions. Best practice is to create an adapted company specific development guide containing your
development guidelines like:
ETL and QVD strategy
Security requirements
Application Lifecycle Management
Platform strategy from a development perspective
When it comes to development, Qlik Sense offer a wide range of flexibility. For many reasons there’s a
good idea to set up a corporate developing best practice. A corporate developing standard doesn’t only
include standards for how to optimize each and every single application but does also embrace
methodologies and practices like reusability and overview.
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Standards
It’s important to have and use standards during Qlik development. There are many ways of getting the
same result, but not all of them are efficient and understandable. Utilizing Qlik Deployment Framework in
combination with development guide lines we create consistent multi development environment. Standards
are needed for:
Reuse of data
Reuse of code
Reuse of expressions and variables
Multiple development
Governance
Creating and collecting understandable metadata
Using standards will result in lower cost of ownership by making governance easier and TCO lower.
Developing using QDF Containers
Qlik Deployment framework is based on the concept of resource containers. Containers are security
boundaries, isolated file structures placed side by side. A container can be moved and/or renamed without
changing any Qlik script logic. Each container has identical file structures and contains predefined script
functions.
QDF Deploy Tool
Containers are created using the QDF Deploy tool available for download on Qlik community. The container
script code is open source available on GitHub approved updated will be incorporated into the deploy tool
that also updates existing frameworks to latest standard. Read more regarding Deploy Tool in the
attached Read-me notes.
Container Type Selector
From QDF version 1.6.5 you have the possibility to select between three container layouts. This mean that
QDF Deploy tool extracts different container layout (folders) depending on the selection done in the
Container Type Selector. The different settings and correlating layout are presented below.
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Classic Container (default) has same container layout as traditional QDF (from version 1.0)
Qlik Sense Only Here we have removed everything related to QlikView, for example Application
and mart folders. Extract, Transform, Load folders have also been added under the QVD structure.
Slimmed Down is intended for smaller deployments and several folders have been removed.
Extract, Transform, Load folders have also been added under the QVD structure.
Classic Container
Qlik Sense Only
Slimmed Down
Deployment Framework always includes.
Administration container it’s from here additional containers are created and managed.
Shared folders. A fresh QDF installation always contains a shared container, this is a repository to
store scripts, configuration and data files that are shared and reusable by all applications.
Example This is a container containing some examples and QVD files, this is used during the
exercise documentation.
Folder Naming Convention
Folder names inside the container are standardized and simplified to fit as many languages and companies
as possible. Before each container and subfolder there are a sequential number that makes it easier to
document the structures. Example 1.2.1 symbolizes the first Container (1), The QVD folder (2) and a
subfolder (1). This can also be used as name convention for reload tasks. Follow the number sequence and
never use space when creating new containers or subfolders inside the container.
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Sense only container
Container folders
Global Variables
0.Template
1.QVD
2.Config
vG.QVDPath
vG.ExtractPath
vG.TransformPath
vG.LoadPath
vG.ConfigPath
3.Include
vG.IncludePath
1.Extract
2.Transform
3.Load
1.BaseVariable
vG.BaseVariablePath
2.Locale
vG.LocalePath
3.Custom
4.Sub
vG.CustomPath
vG.SubPath
4.Export
vG.ExportPath
5.Import
6.Misc
vG.ImportPath
Info.txt
Version.xx.txt
Description
Folder used for examples and templates. Only exists in the
0.Administration Container.
QlikView Data files are stored in subfolders under 2.QVD
Extract path for QVD files
Transform path for QVD files
Load path for QVD files
Configuration and language files like Excel and txt. This folders
could be shared to make configuration changes easier
Folder where QlikView Include files are stored. These are script
parts that are called from the main QlikView script.
Stores all the variables needed to use the framework, like paths
inside the container
Locale for different regions, used for easy migration between
regions
Store for custom include scripts
Store for sub routines, this is a way to reuse code between
applications
Folder used to store from QlikView exported data, probably txt or
qvx
Folder used to store import data from external systems
To store documentation, extension and other things related to this
container
Information files describing the folder purpose and Path variable.
There are Info files in every folder.
Version Revision list
Container Variables
Each preinstalled folder in a container has corresponding environmental variable (Global Variable).
Scripting using these variables makes it possible to move code and applications between containers without
any script modifications, it also makes it possible to seamlessly share scripts between QlikView and Qlik
Sense. To initiate QDF and create the global variables an initiation script (InitLink.qvs) need to be added in
the beginning of the Qlik Sense load script.
Global Variables
Global variables are auto-generated by QDF during the initiation script, these variables are named Global
because they and reused between applications across a container. The name standard is vG.xxx (Variable
Global).
Custom Global variables and Universal variables
Custom Global Variables are framework variables created manually by the developers. These
variables are also auto-generated during initiation using the CustomVariables.csv , that file exists within
each container under 3.Include\1.BaseVariable. Adding name and value in this csv file makes variables
available for the Qlik Sense applications that is using the home folder where the csv is resided.
o Global variables should only be used when variables are shared by several applications in a
Container.
Universal Variables is similar to Custom but used across multiple containers. Universal are stored in
the Shared Folders Container creating a “single point of truth” across all containers. Universal Variables
are stored in $(SharedBaseVariablePath)\CustomVariables.csv file and loaded during the framework
initiation process.
o Universal variables should be used when variables are shared by several applications across
all Containers.
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Additional Variable Convention
It’s important to follow a variable naming convention so that existing application variables don’t collide with
the framework variables. A name standard also makes it easier to understand and search among variables.
Store often used expressions as Local variables
Store reusable expressions as Global or Universal variables
Extended name standard for Variables are possible, example:
o Local expressions variables starts with vL.Calc_
o Global expressions variables starts with vG.Calc_
Variables defining a path should always end with a ‘\’
Reset local variables that are only used inside the script and not in the UI.
Enter the variable name and =; example: SET vL.test =;
Get started with Qlik Deployment Framework Containers
Qlik applications need to have an initiation include script in the beginning of the load script which identifies
the current environment (within your home container) and generates global variables. These variables are
used during Qlik Script development.
Initiate QDF in Qlik Sense
To learn how to initiate QDF with Qlik Sense please read Qlik Deployment Framework-Qlik Sense
Getting Started Guide.pdf.
Linking (mount) Containers
After QDF initiation you can start using the sub function library (more documentation later in this document)
below function is important as it creates Global Variable Links other resource containers (and available
folders). The benefit of using Global Variable links in the script is to create generic, reusable and movable
code as QDF validates and regenerates the links every time the script runs.
Load Container Global Variables (LCGV)
By using LCGV function it’s possible to create Global Variable links (mounts) between containers (security
access needed).
Example: call LCGV('AcmeTravel') Will create all Global Variables linking to 2.AcmeTravel container.
Variables created will have similar name as home container but with the additional AcmeTravel prefix, like
vG.AcmeTravelQVDPath for QVD path to AcmeTravel container
call LCGV('Oracle','QVD;Include'); Will create two Global Variable links to different resources in
Oracle container, by using an additional switch and ‘;’ separator creates Global Variables
vG.OracleQVDPath and vG.OracleIncludePath (instead of linking all folders as in the first example).
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Reuse of script code
For easier manageability and faster development, it’s recommended to reuse script code as much as
possible. By using Deployment Frameworks predefined structures and variables it’s easy to reuse script
code. There are two ways of reusing code in Qlik Script:
Include files
Use of functions
Include files
An include file is just a Qlik script (text file) that is included into the main script during execution. Qlik include
scripts use the prefix qvs. The entire or parts of the script can thus be put in a file for reuse.
All Include files are stored in 6.Custom folder, the global variable for 6.Custom folder is vG.CustomPath and
should always be used when accessing a custom script, meaning that it’s not a part of the Deployment
Framework initiation process. Example: $(Include=$(vG.CustomPath)\1.xyz_Calculations.qvs);
Sub Functions
Qlik have the possibility of reusing scripts and functions by using the Sub and Call commands. As
presented above with the LCGV function. The Framework contains library of nice to have functions. All sub
functions are stored under the 3.Include\4.Sub folder and are initiated during QDF initiation.
Use Call function_name(‘Input parameters or variables’) command to execute the preloaded function.
Another function example, vL.FileExist will return true of false depending on if the file exists
Call vL.FileExist ('$(vG.QVDPath)\SOE.qvd')
QlikView Components (QVC)
Optionally, the open source library QlikView Components (QVC) can be installed using the deploy tool in
addition to the built-in QDF library, read more on QVC here. If QVC been installed it can be disabled in the
script by adding this line before QDF initiation:
set vG.QVCDisable='true';
Hint. Add additional sub functions, Qlik Community is a good place to look, instead of coding everything
from scratch.
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Pre-Defined Functions
QDF contains library of functions that is loaded automatically during initiation. A copy of the function library
is stored under every container, but the primary sub function library is located under 3.Include\4.Sub in
Shared_Folders container.
If no Shared container exists, as a backup the local container sub function library will be used. Meaning as
long as a Shared folder exists all sub function additions should be stored under the Shared container
The preinstalled Sub functions that exist under 3.Include/4.Sub folder should not be deleted or
modified, this library is used by Qlik Deployment Framework initiation process.
Qlik Deployment Framework- Function Reference Guide
The function reference guide is available as a separate document Qlik Deployment Framework-Function
Reference Guide.pdf. As the sub functions are identical to both Qlik Sense and QlikView the same guide
applies to both platforms.
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Data Modeling
Understanding
The cornerstone of Qlik is the associative in-memory search technology.
There are some very specific characteristics with this technology that you have to keep in mind.
Two fields in different tables with exactly the same name, case sensitive, will automatically be
connected to each other and fields with exactly the same field value, case sensitive, will be
associated with each other.
If two tables have more than one field in common, Qlik will automatically create a synthetic key a
kind of link table. The easiest way to detect a synthetic key is by opening the table viewer (Ctrl-T):
Synthetic key
Another characteristic with the associative database is that the number of distinct (unique) values in a table
is more important than the number records. By delimit the number of distinct values in a table the
performance of an application can be significantly improved.
Example: Let´s say you have a fact table with 1 billion recs, one of the fields is a timestamp field containing
date and time (measured down to fraction of seconds) with almost 800 million distinct values. Two
alternative actions will both improve the performance:
If you don’t need to analyze on time level, simply transfer the field to a date field (use CalendarGen
function) and there will not be more than 365 distinct values for one year.
If you need to analyze on time level, determine on what time level you need to analyze (hour,
minute) and create a new field, Time. Depending on what level you decide to analyze, hour will give
you 24 distinct values and minute will give maximum 1440 distinct values)
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Data models
Represented below are diagrams of 3 basic data models that can be built in Qlik (along with many other
combinations). Using these 3 examples we can demonstrate some of the differences in performance,
complexity and flexibility between them.
Option 1
Snowflake
Option 2
Star Schema
Option 3
Single Table
Multiple fact tables
While star schemas are generally the best solution for fast, flexible QlikView applications, there are times
when multiple fact tables are needed. Here are the wrong and right ways to join them:
Option 1, Wrong
Does not Work!
Option 2, Right
Concatenated Fact table
Recommended by Qlik
Option 3, Right
Link Table
Works on small data sets
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Further examples of how to build and use link tables are contained in Qlik Community on line
(http://community.qlik.com/)
To show how this could be accomplished, the section below takes us through a scenario of two facts tables
to be combined into one fact table.
A concatenation of fact tables example.
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Preceding Loads
The use of preceding load statements can simplify your script and make it easier to understand.
See the code below for an example of this.
Table1:
LOAD
CustNbr as [Customer Number],
ProdID as [Product ID],
floor(EventTime) as [Event Date],
month(EventTime) as [Event Month],
year(EventTime) as [Event Year],
hour(EventTime) as [Event Hour];
SQL SELECT
CustNbr,
ProdID,
EventTime
FROM MyDB;
This will simplify the SQL SELECT statement so that the developer can continue to test/augment the
statement using other tools, without the complexity of the Qlik transformations embedded in the same SQL
statement.
For more information on the Preceding LOAD feature, see the help.qlik.com.
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Optimization strategy
Qlik is known for its wide user adoption. One of the main reasons for this is its capability to manage large
data sets with short response time. Although a Qlik application most often is easy and fast to develop it’s a
very good idea to establish an optimization strategy as part of your development platform. For long term
success it is strongly recommended that you have an optimization focus in your application development,
especially when you know that the application should hold a large data set and be distributed to a large
number of users. A good idea is to have an optimization step connected to the validation/approval phase in
your development process, this of course both for new applications as well as for changed/ improved
applications.
Optimization Tips and Tricks
Please keep in mind that what really counts when it comes to optimization of a data model is the
number of records.
Don’t normalize data too much. Plan for 6 – 10 total tables in a typical application. This is just a
guideline, but there is a balance to be struck with data models. See the Data Model section of this
document for more details.
Eliminate small “leaf” tables by using Mapping Load to roll code values into other dimensions or fact
tables.
Store any possible field as a number instead of a string
De-normalize tables with small numbers of field
Use integers to join tables together
Only allow 1 level of snow flaked dimensions from the fact record.(fact, dimension, snowflake,
none)
Use Autonumber when appropriate, will reduce application size
Split timestamp into date and time fields when date and time is needed
Remove time from date by floor() or by date(date#(..)) when time is not needed
Reduce wide concatenated key fields via Autonumber, when all related tables are processed in one
script (There is no advantage when transforming alphanumeric fields, when string and the resulting
numeric field have the same length)
Use numeric fields in logical functions (string comparisons are slower)
Is the granularity of the source data needed for analysis? If not aggregate by using aggregating
function like“sum() group by”
Create numeric flags (e.g. with 1 or 0)
Reduce the amount of open chart objects
Calculate measures within the script (model size <> online performance)
Limit the amount of expressions within chart/pivot objects, distribute them in multiple objects (use
auto minimize)
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Other scripting best practices include:
Use Autonumber only after development debugging is done. It’s easier to debug values with a
number in it instead of only being able to use surrogates. See Reference Manual if you are not sure
how/when to use Autonumber.
Put subject areas on different tabs so you don’t confuse the developers with too much complexity
Name the concatenate/join statements
Use HidePrefix=%; to allow the enterprise developer to hide key fields and other fields which are
seldom used by the designer (this is only relevant when co-development is being done).
When using the Applymap() function, fill in the default value with something standard like ‘Unknown’
& Value which is unknown so users know which value is unknown and can go fill it in on the source
system without the administrators having to get involved. See Reference Manual if you are not sure
how/when to use Applymap().
Never user Underscores or slashes (or anything ‘techie’) in the field names. Instead code user
friendly names, with spaces.
Instead of:“mnth_end_tx_ct”use:“Month End Transaction Count”
Only use Qualify * when absolutely necessary. Some developers use Qualify * at the beginning of
the script, and only unqualify the keys. This causes a lot of trouble scripting with left join statements,
etc. It’s more work than it’s worth in the long run. See Reference Manual if you are not sure
how/when to use Qualify and Unqualify.
Use variables for path name instead of hard-coding them throughout your script. This reduces
maintenance and also provides a simple way to find paths (assuming you put them in the first tab to
make it easy to find).
All file references should use Container naming convention.
Always have the Log file option turned on if you need to capture load-time information for
debugging purpose
Comment script headings for each tab. See example below:
Comment script sections within a tab with short descriptions. See example below:
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