Check a Windows Service, if it’s not running, start it via batch script

Following a system restart, an overnight shutdown or a system update, some Windows services don’t always come up successfully. This script runs via Windows Task Scheduler and accepts one or more service names.

Log files are produced when a service is found to not be running (updated 16/05)

If the service isn’t running, it attempts to start it – and produces a log file to capture the incident.

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An updated Version Control tab for Qlik Sense & QlikView

This updated snippet (see original post from 2018) is available on GitHub, and included in this post.

The main benefits of this script are that it requires a single row addition per log, with no manual increment of the version number, and the version control information can be surfaced by the engine either to the UI or via the APIs.

This assumes a HidePrefix of %.

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Qlik Sense Release Version & Support List

Qlik Sense log files usually contain a reference to a build or engine number, and I’ve not yet found a complete list – so I’ve created one.

This list contains the current (at time of writing) list of Qlik Sense external version names to build number, release dates and end of support dates.

For the latest version of this list (and in CSV format), visit https://github.com/withdave/qlik-releases

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QVD read/write performance comparison in Qlik Sense Enterprise with QVD and QVF encryption

Following on my previous post, I had a look at the performance impact of enabling QVD and QVF encryption in Qlik Sense.

In this test, I’m using Qlik Sense Enterprise November 2019 release on an Azure B4ms (4 vCPU, 16GB RAM) VM running Windows Server 2019. Qlik Sense encryption settings were left at default.

A sneak peak of the results for the largest data set tested
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Qlik Sense QVD / QVF Encryption (Qlik Sense Enterprise on Windows)

From Qlik Sense Enterprise on Windows September 2019 (the option became configurable via the QMC in November 2019), users have the option of enabling one or both of QVD and QVF encryption – adding at-rest protection from people who shouldn’t have access to your valuable files. This is enabled server-wide and applies to all content on the environment.

The big issue that I see is that any security office is going to require that any and all encryption is enabled – without understanding the issues this could cause.

Here’s the new DATA ENCRYPTION section under Service cluster in the QMC
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AWS Lightsail snapshots – now automatic for Linux

As an update to my previous post on using lambda to automate snaphots, I’ve finally logged back into the Lightsail console and seen they have added a new feature – automatic snapshots.

There’s now an automatic snapshot section – note that the manual snapshots above are the 14 days dutifully maintained by the lambda script

It looks like the feature was added in October, based on the help site.

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Remove (destroy) all variables in a Qlik Sense application

In QlikView, you had the ability to select multiple variables and delete them en-mass. In Qlik Sense, the UI permits you to undertake this activity one-by-one, and each takes two or three clicks.

This bookmarklet (Chrome only this time, not tried elsewhere) removes ALL variables from a Qlik Sense application by cheating the APIs used by the Qlik Sense client.

Demo showing addition of bookmark and destruction of variables in a Qlik Sense app
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