PostgreSQL Usergroup NL Summer of 2026 Meetup

Dear all,

With summer just around the corner, we are happy to invite you to the Summer Edition of the PostgreSQL User Group NL Meetup on June 25th 2026 in Amsterdam.

This time we have been invited by Databricks to host the event in their Amsterdam headquarters. We are very appreciative of this gesture and we like to thank them for supporting the PostgreSQL community with the venue and the hospitality.

On the agenda we have two PostgreSQL experts in their field. First up is an alumni presenter of the PostgreSQL User Group, Matthias van der Meent, who will be taking us on a deep dive into one of the better known index types: GiST. Next on the program is Bart Orbons, who will centre his presentation around grouping.

As usual, we have reserved some space in the program for anyone who wants to do a lightning talk. If you are interested, please contact us via a personal message on meetup.com.

We are very grateful for the contributions of both presenters as well as our host, to make this all possible for the PostgreSQL community in the Netherlands.

We hope to meet many of you at the meetup — a moment where PostgreSQL users can connect, share knowledge, and discuss the latest developments in the PostgreSQL ecosystem.

We look forward to a great meetup!
Feike Steenbergen Gerard Zuidweg

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Meetup Program
17:30 – 18:25 — Welcome, Beer & Bites 18:25

18:30 — Opening

18:30 – 19:10 — GiST indexes: An analysis – Matthias van der Meent
Abstract: PostgreSQL has various index types, each supporting different query patterns and behaviours. In this talk, Matthias will go over one of the better known index types: GiST — how and where it is used, how it works, its strengths, its weaknesses, and some possible improvements.
About Matthias: Matthias van der Meent is a PostgreSQL hacker and contributor with over 5 years of contributions to the project. His focus is mostly on subsystem performance, indexing, and resource usage.

— (Very) Short Break —

19:15 – 19:55 — 'Grouping, the way you want it' – Bart Orbons
Abstract: This talk dives into PostgreSQL's advanced grouping features, showing how to go beyond a plain GROUP BY to aggregate data exactly the way you need it. Expect practical examples that make complex reporting queries simpler and more powerful.
About Bart: PostgreSQL user and enthusiast. Started using PostgreSQL in 2000 and has not stopped since — having worked before with Sybase and Oracle, but not anymore. Until four years ago, Bart worked at XS4ALL Internet as a technical software architect focused on database and software modelling, until the company was folded into its parent organisation. He then helped migrate the customer base into their systems before moving on to his current role at Z-CERT, where he helps set up company administration and systems. A regular at pgconf.eu, this talk is part of a series Bart originally created for colleagues at XS4ALL to improve their SQL skills and introduce newer features of the SQL language.

19:55 – 20:00 — Lightning Talks

20:00 – 20:30 — Wrap-up and drinks