PostgreSQL Usergroup NL Meetup - The Fall Edition

Dear all,

We are happy to invite you to the next edition of the PostgreSQL User Group NL Meetup on 29 september 2026 in Amsterdam.

This time we have been invited by ABN AMRO to host the event at their offices on the Gustav Mahlerlaan. We are very appreciative of this gesture and would like to thank them for supporting the PostgreSQL community with the venue and the hospitality.

On the agenda we have two great talks. First up is Sebastiaan Mannem, who will take us deep into the PostgreSQL IO subsystem, following data changes from query to datafile and everything that happens in between. Next on the program is Peter Lengkeek, who will share his journey into CloudNativePG (CNPG).

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!
Gerard Zuidweg
Feike Steenbergen

Meetup Program

17:30 – 18:25 — Welcome, Beer & Bites

18:30 — Opening

18:30 – 19:10 Postgres IO internals: Between query and datafile
Sebastiaan Mannem - CTO Nibble IT

Abstract: When a query inserts, updates or deletes data (DML), or objects (DDL), these changes end up in the Postgres datafiles — but not immediately. Where does the data end up in between, and which process(es) take care of that? And why, and how? How does Postgres remain consistent — what does it keep consistent, and what is never consistent? And how does the changed data end up on the standby — how is synchronous replication implemented? These are some deep questions, and we will try to tap into many (if not all) of them, and more, as we follow data changes from query, through the PostgreSQL IO subsystem, until it hits the data files.

About Sebastiaan: Technically driven database, container and cloud specialist. Earned my stripes and was battle hardened by the Dutch Government. As CTO of Nibble-IT I do all I can to make our customers successfull with PostgreSQL, which includes: enable with design, build stuff, enable the next generation of consultants and developers.

— (Very) Short Break —

19:15 – 19:55 — My journey into CNPG – Peter Lengkeek DBA for CloudNativePG – Savepoint

Abstract Getting familiar with CloudNativePG, running PostgreSQL on Kubernetes, is not difficult. Install Kubernetes on your Windows or MacBook and start. Create My first cluster, yes! Going further, is for most PostgreSQL DBA’s a bigger step to take. Learning Kubernetes concepts and all the available tooling, related to CloudNativePG and Kubernetes. Often, I see organizations struggling with the implementation of CloudNativePG as a product, although the have chosen the product on corporate level.
In my presentation I share my journey into CloudNativePG. Hopefully, to support PostgreSQL experts to go the same road. Also, I want to reflect some aspects of the implementation of CloudNativePG in organizations.

About Peter: I started 35 years ago, working with Oracle database technology. Mainly in the role of a Database Administrator and Developer, specialized in the combination of technology and organization.
At the beginning of 2024 I started a consultancy job at a client of OptimaData with PostgreSQL database technology. I jumped into a "pressure cooker" to learn all kind of PostgreSQL knowledge compared to my reference model of Oracle.
Since August 2024 I’m focused on the CloudNativePG operator for PostgreSQL databases on Kubernetes. For me, the way to go! I was several times a guest lecturer for an intro training CloudNativePG, including the Blue Elephant Pack. I'm happy to help organizations and DevOps teams get the most out of CloudNativePG.

19:55 – 20:00 — Lightning Talks

20:00 – 20:30 — Wrap-up and drinks