It has been around for a few years.

Personally, I hesitate to use the alias capability lest I find myself in an environment without them! 

Try ":sql" instead of 

d $system.SQL.Shell()

This is an excellent article Murray! Thanks for putting it together. It was exactly what I needed for a conversation this morning. 

ENSDEMO is not included in IRIS installations. However, it is available here: https://community.intersystems.com/post/install-ensdemo-iris. 

The command $SYSTEM.SQL.DATEDIFF(outputFormat, start, end) is also quite useful for date arithmetic. It is a lot less picky about the format and a lot more powerful regarding the output. 

Write quote Hello World,
Dollar SYSTEM Dot Process
Dot Terminate(Pid)

The biggest question will be whether or not you have any sensitive information stored outside of Ensemble. 

Please note with Caché/Ensemble Encryption there is no backdoor. 

When a language isn't strongly typed, I often test unexpected but possible types -- for example: Numbers or Strings instead of Dates or Booleans. 

Other favorites: 

• ""
• "null"
• "undefined" 
• Quotes, comments, and other injection attack patterns. 

As Jon Willeke suggested, I also use random data when possible (apart from the -1, 0, 1 defaults).  The %Library.PopulateUtils class can be helpful for generating other preformatted random information. 

The version of the documentation should be clearly displayed as there are differences between the respective versions (and not just in appearance). 

The ordering of the sidebar is confusing to the point that I find it distracting.