Neues vom PostgreSQL Planet

Open-source Citus delivers millions of queries per second more efficiently than Neki, the only other published data point at this scale

Last month PlanetScale published a blog post on how they achieved 118 million queries per second on Neki, their sharded Postgres. It included data points at 5, 50 and 512 shards, and showed the scalability between them.

PostgreSQL and NUMA, Part 3 of 4

This series covers the specifics of running PostgreSQL on large systems with many processors. My experience is that people spend months often learning the basics when confronted with the problem. This series tries to dispel these difficulties by providing a clear background into the topics in question. The hope is that future generations of database engineers and administrators don’t have to spend months figuring things out through trial and error.

📌 Summary

84% of surveyed Rails developers use PostgreSQL in production

While PostgreSQL is less popular than Oracle, MySQL, and Microsoft SQL Server today, the gap is narrowing

Win a signed copy of High Performance PostgreSQL for Rails, see below for details

The 2026 version of the Ruby on Rails Community Survey results are now live.

Two things caught my eye: just how much PostgreSQL is in production for Rails apps, and the learning resources Rails developers use.

My job at pgEdge allows me a significant amount of time to work on pgAdmin, a project I started nearly 30 years ago. The previous blog and this followup is an update on some of the recent work I’ve been doing.In my last post I wrote about moving pgAdmin's build farm from Jenkins to GitHub Actions, and I promised a follow-up about , which is the least famous repository in the pgAdmin organisation and quietly one of the most important.

Some time ago I read this blogpost. They wrote about logging changes to table using a trigger, but one thing that caught my attention was: Storing only the changed columns made the log five times smaller and the trigger slower. Figured I can try it myself… Unfortunately they didn't provide schema of table, nor test … Continue reading "Old tech is sometimes better – a case study based on blogpost from Now-Next…"

Prairie Postgres just turned two! We say “community building” often, maybe not always thinking about what it means, but looking back on the past two years, I can confidently say the most important achievement, the one I’m most proud of, is reshaping the Chicago Postgres Community.

Configure a replication slot name on your standby and the upstream keeps WAL forever—until the slot itself fills your disk or the standby dies holding an old… (I consult on PostgreSQL through PGX Inc..)

A PostgreSQL session idle in transaction, measured on 17: what it blocks (locks, ALTER TABLE, vacuum) and how idle_in_transaction_session_timeout ends it.

PostgreSQL error 40001 'could not serialize access due to concurrent update', measured on 17: when it fires, why SKIP LOCKED does not avoid it, and the retry.

Restoring a pg_dump 17 file into PostgreSQL 16 fails with unrecognized configuration parameter transaction_timeout. Measured fixes, plus four other causes.

'remaining connection slots are reserved for roles with the SUPERUSER attribute': why PostgreSQL refuses you, measured on 15–17, and how to free slots.

What raised 'invalid input syntax for type uuid' in PostgreSQL 17, measured: which strings cast, 'undefined' from a driver, '' from a setting, and fixes.

PostgreSQL has no CREATE POLICY IF NOT EXISTS. Three ways to write a repeatable policy migration, measured on PostgreSQL 17 and 18: gaps, locks and races.

Setting the tenant for PostgreSQL row-level security in Rails 8.1, measured: before_action, a transaction per request, threads in a request, failed writes.

What raised 'stack depth limit exceeded' in PostgreSQL 17, measured: triggers, recursion, a policy reading its table via a function, long expressions.

Setting the tenant for PostgreSQL row-level security in TypeORM 1.1, measured: dataSource.query, QueryRunner, transactions, and an injected repository.

Where to set the tenant for PostgreSQL row-level security in Spring Boot 4 and Hibernate 7, measured: DataSource wrapper, interceptor, @Transactional, provider.

We’re continuing our review of the March CommitFest for PostgreSQL 19. This second article in the series covers the changes related to our DBA1 and DBA2 courses.

As a reminder, here’s the plan for our coverage of the final PostgreSQL 19 CommitFest:

Part 5.1 (QPT)

Part 5.2 (DBA1, DBA2) -- you are here 🙂

Part 5.3 (DBA3, DBS)

Table Of Contents

1. Build Your PostgreSQL RBAC Lab
2. Meet Our Credit Card Application — The RBAC Scenario

3. Robert Haas: Hacking Workshop for November 2026

   15. Oktober 2026 - 19:04
   Álvaro Herrera will be joining us in November to discuss, when our monthly hacking workshop will cover Table repacking, done right. If you're interesting in joining us, please sign up using this form and I will send you an invite to one of the sessions.Read more »