The title of the contest subject is not quite precise but addresses the %Library.classes involved.
What is meant is officially named Class Query and is dating back to the early days of Caché.
CLASS is used because it is embedded in a COS class.
Though there is a precise description in the official documentation it remains rather abstract.
My tutorial should guide you step-by-step through a simple example in COS to make it tangible to you

As you know in Caché / IRIS you have the possibility to define a property as Multidimensional as documented here:
https://docs.intersystems.com/iris20201/csp/docbook/DocBook.UI.Page.cls?KEY=GOBJ_proplit#GOBJ_proplit_multidim
and the explanation of how to use it
https://docs.intersystems.com/iris20201/csp/docbook/Doc.View.cls?KEY=GOBJ_proplit#GOBJ_proplit_multidim_values

Though the access is quite comfortable (in traditional COS sense) there are 2 main restrictions that hurt:

#1) It is not saved to disk unless your application includes code to save it specifically.
#2) It cannot be stored in or exposed through SQL tables
there are some more
I'll show how to overcome these limits

Hi developers!

You are experts in IRIS and know all tricks. The functionality of $ZF(-1,-2,-100, ......)
is nothing new to you And you know the limits of this functionality.
Both give you access to your local server command line environment. And that's it.

During my recent work on Tutorial - Working with %Query #1
I met a Class Property that is quite different from its same-named relatives.
It is there since 'ever' but is rarely used, Related doc doesn't help so much.

This tutorial is a follow on to Working with %Query
It was displaying the content of the input stream chopped in fixed-size chunks.
But often those streams are structured and have well-defined separators (e.g HL7)
So as a side subject of this tutorial, this chapter shows how to break a stream into PIECES.

It is exactly the same idea as the $PIECE() function for strings with some add-ons.

My previous article introduced you to the COS based Custom Class Query.
There were some features missing like more lines of the stream displayed
and numbered.

We are looking for Innovators!

We invite early stage startups to join Caelestinus digital health and FHIR startup incubator for the season 2023!

Hi Community,

Please read this when you have the time and keep an open mind. Also, you are welcome to tell me it is a terrible idea.

The main reason for this post

If you look at NPM, it has 1.3 million packages. Now ask yourself, is this an achievement or a nightmare?
How many of those packages are no longer supported?
How many of those packages break compatibility on version changes?
How do you know which one to use?

Some technical background information

There is not just one class in this package: rcc.gstream.cls but also rcc.gstreamT.cls

While rcc.gstream works with direct access to the stream globals, the *T version uses
a Process Private Global (PPG) as Temporary storage.
using SELECT * FROM RCC.gstreamT WHERE RCC.useT('^jpgS')=1 and similar.

Dear community!

It was an amazing 2022 with all of you. Great questions and articles around the whole year and this brings us the most valuable gifts -- wisdom and knowledge.
I want to thank you all for a great year full of fun and pleasure.

This community rocks.

Overview

Predictable storage IO performance with low latency is vital to provide scalability and reliability for your applications. This set of benchmarks is to inform users of IRIS considering deploying applications in AWS about EBS gp3 volume performance.

Summary

• An LVM stripe can increase IOPS and throughput beyond single EBS volume performance limits.
• An LVM stripe lowers read latency.

Hi Community,

The day has arrived — InterSystems FHIR Healthtech Incubator Caelestinus Final Demo Day, November 30, 2022!

We started Caelestinus 8 months ago in March with 22 outstanding teams. Today 15 teams will pitch what they have achieved so far and their message to the market!

I’m pleased to invite everyone to InterSystems FHIR Health Tech incubator Caelestinus Demo Day, which will happen in a hybrid online/offline mode: you can watch pitches online via www.caelestinus.tech starting at 2 p.m. CET or go in-person in IKEM — Institute for Clinical and Experimental Medicine, the largest Czech medical research and clinical hospital.

https://www.youtube.com/embed/sC-R9MflORg
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VR ICU®

Try to register via the Global Master Challenge to the event below, but it said the challenge is no longer available.

Let's meet virtually at our Third Community Roundtable! This will be a 60-min discussion on a given topic: Developing with Python.

Register through >> this Global Masters challenge <<