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Why do these clauses affect SQL performance?

select ID from some_table where row_status in ('I','U') order by ID limit 5 - makes the query infinite
select top 10 ID from some_table where row_status in ('I','U') order by ID - the same
select ID from some_table where row_status in ('I','U') order by ID - is fast

Actually there are no rows in the table having row_status 'I' or 'U'.

I asked Gemini and it recommended me rewrite the query as

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As applications grow, every database eventually hits scaling limits. Whether it's storage capacity, concurrent users, query throughput, or I/O bandwidth, single-server architectures have inherent constraints. This guide explains fundamental approaches to database scalability and shows how InterSystems IRIS implements these patterns to support enterprise-scale workloads.

We'll explore two complementary scaling strategies: horizontal scaling for user volume (distributing computational load) and sharding for data volume (partitioning datasets). Understanding the general principles behind these approaches will help you make informed decisions about when and how to scale your IRIS applications.

The examples in this guide use InterSystems IRIS in Docker containers.

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Hi Community,

We’re excited to invite you to take part in shaping the next generation of ObjectScript development tools. We’re working on an AI-powered ObjectScript coding assistant designed specifically for IRIS developers. Not a generic AI adapted for ObjectScript, but a solution built from the ground up to understand ObjectScript idioms, IRIS APIs, interoperability productions, and real-world developer workflows.

To make sure we build something truly useful, we need your input.

👉 ObjectScript Coder Agent Developer Survey 👈

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Article
· Jan 21 2m read
Archiving my OEX packages

Over the last 9 years, I published more than 90 packages in OEX.
And over this time, conditions and environments changed.
In the beginning, there was

  • no Docker
  • no IPM/ZPM
  • no embedded Python, no AI
  • Caché, Ensemble, CSP, ZEN, .... were dominating

As time changed, also product versions and external languages changed.
Adjustment of a few packages was no issue in the beginning,
and was a matter of support quality to my "consumers".

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Hey Community,

Enjoy the new video on InterSystems Developers YouTube:

⏯ Innovations in FHIR Data Management@ Ready 2025

https://www.youtube.com/embed/Q5CrlqcJAkA
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We’re excited to announce the first mini hackathon “Building AI Agents with InterSystems”, taking place on a pre-conference day as part of InterSystems READY 2026.

In this hands-on challenge, participants will design and build AI agents using upcoming InterSystems capabilities, exploring how intelligent automation, orchestration, and reasoning can be applied to practical use cases.

    📅 Event date: 27 April 2026
    📍 Location: Gaylord National Resort & Convention Center, National Harbor, Maryland
    🔗 Learn more here: Building AI Agents with InterSystems mini-hackathon at InterSystems READY 2026

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    Hi, I have simple email alert setup (EnsLib.EMail.AlertOperation) where in operations I have SMTP server setup and Recipients emails.

    Also I find Alert Groups dropdown option in operations, processes, how this is different from setting up simple email alert with recipients list?

    Please advise.

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    Hey Community!

    We're happy to share the next video in the "Code to Care" series on our InterSystems Developers YouTube:

    ⏯ How Big Research Bets Are Made Without a Crystal Ball

    https://www.youtube.com/embed/JE2ssBbsh8w
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