Introduction

** Revised Feb-12, 2018

While this article is about InterSystems IRIS, it also applies to Caché, Ensemble, and HealthShare distributions.

Introduction

Memory is managed in pages. The default page size is 4KB on Linux systems. Red Hat Enterprise Linux 6, SUSE Linux Enterprise Server 11, and Oracle Linux 6 introduced a method to provide an increased page size in 2MB or 1GB sizes depending on system configuration know as HugePages.

At first HugePages required to be assigned at boot time, and if not managed or calculated appropriately could result in wasted resources. As a result various Linux distributions introduced Transparent HugePages with the 2.6.38 kernel as enabled by default. This was meant as a means to automate creating, managing, and using HugePages. Prior kernel versions may have this feature as well however may not be marked as [always] and potentially set to [madvise].

Transparent Huge Pages (THP) is a Linux memory management system that reduces the overhead of Translation Lookaside Buffer (TLB) lookups on machines with large amounts of memory by using larger memory pages. However in current Linux releases THP can only map individual process heap and stack space.

Hi

I have a Zen Page with tablepane which has a datasource in a different namespace to that of the Zen Page. When the page is run, no data is returned and the tablepane is not populate, even though the rerferenced table contains dat.

The tablePane code is as follows:

I was able to run the Cache terminal from the command prompt with the following command, in the namespace that I provided in the brackets:

cterm /console=cn_ap:ENSEMBLE[TEST_1]

But the command suddenly stopped opening the terminal in the correct namespace. It just opens it in the default namespace. I tried it with different namespaces or invalid namespaces, it always opens the terminal in the default namespace now.

I cannot figure out what is causing this behaviour.

Hi,

I'm often required to copy the database from production to test.

This is to 'refresh' the database on test.

To achieve this I copy all required IRIS.DAT files from production to test.

The nodes are mirrored on production.

The nodes are not mirrored on test.

Each of the database files IRIS.DAT has a mirror attribute.

Is there a way of checking if the mirror attribute is set for the database file? eg. an objectScript program

Hello Community,

We're happy to announce that the InterSystems IRIS, IRIS for Health, HealthShare Health Connect, & InterSystems IRIS Studio 2022.2 is out now!

And to discuss all the new and enhanced features of it we'd like to invite you to our webinar What’s New in InterSystems IRIS 2022.2.

Hello community! I'm working on an internal innovation effort at InterSystems considering our documentation/resources around upgrades. As part of this, I'd love to have your answers to any/all of the following questions, either via comment or (if you prefer your answers to be more private) direct message.

Thanks in advance!

What InterSystems products + versions are you running? ($zv is ideal.)

What makes you decide to upgrade?

What are your blockers to upgrading?

What is your process for evaluating and planning a possible upgrade?

How can I retrive the values present in the Category dropdown at the top of the production in code?

Is there a way to add specific table permissions to a security role programmatically? I'm working on scripting some of the initial setup work when we sell certain add-ons to our software, and I see how I can assign resources to a role and give it a description, but I don't see how I tell it that this role gives the user, for example, SELECT privileges only on the invoices table, or SELECT, INSERT, UPDATE, and DELETE.

Do we have REST API documentation to retrieve the data available in InterSystems Cache.

I am looking for APIs that will help me to pull the data available in InterSystems Cache.

Hi Community ,

Can anyone please explain how to use EnsLib.EMail.AlertOperation operation to send notification to my email id when any error occurs in my production?

Please give any example how to use EnsLib.EMail.AlertOperation operation class

Thanks,

Smythee

InterSystems is pleased to announce the 2022.2 release of InterSystems IRIS Data Platform, InterSystems IRIS for Health, HealthShare Health Connect, and InterSystems IRIS Studio are now Generally Available (GA).

VetsEZ is looking for an InterSystems Technology Platform - Practice Lead to serve our Federal healthcare customers. As a lead systems integrator, VetsEZ has been delivering large-scale implementations for various federal customers, including the Department of Veterans Affairs (VA), with the world's largest footprint of InterSystems technologies. InterSystems Technology Platform comprises core technologies, including HealthShare, Caché, IRIS, Ensemble, DeepSee, and iKnow.

The topic of for/while loop performance in Caché ObjectScript came up in discussion recently, and I'd like to share some thoughts/best practices with the rest of the community. While this is a basic topic in itself, it's easy to overlook the performance implications of otherwise-reasonable approaches.

With IRIS 2021.1, we released a significant revision our SQL utilities API at %SYSTEM.SQL. Yes, that's a while ago now, but last week a customer asked a few questions about this and then @Tom Woodfin applied gentle mental pressure ;-) to make me describe the rationale of these changes in a little more detail on the Developer Community. So here we go!