Ardent Performance Computing
PostgreSQL
Postgres Replication Links
Our platform team has a regular meeting where we often use ops issues as a springboard to dig into Postgres internals. Great meeting today – we ended up talking about the internal architecture of Postgres replication. Sharing a few high-quality links from our discussion: Alexander Kukushkin’s conference talk earlier this year, which includes a great … Continue reading
Losing Data is Harder Than I Expected
This is a follow‑up to the last article: Run Jepsen against CloudNativePG to see sync replication prevent data loss. In that post, we set up a Jepsen lab to make data loss visible when synchronous replication was disabled — and to show that enabling synchronous replication prevents it under crash‑induced failovers. Since then, I’ve been … Continue reading
Run Jepsen against CloudNativePG to see sync replication prevent data loss
Are you in the Pacific Northwest? Want to learn more about topics related to this blog? At 3:15p on Thu Nov 13 in KubeCon Atlanta, I’ll be speaking with Leonardo Cecchi about distributed systems theory applied to standard open source postgres cluster reconfigurations. Jepsen is a testing framework for distributed systems that verifies safety guarantees … Continue reading
Graviton2 versus Graviton4
Just a short post, because I thought this was pretty remarkable. Below, I have screenshots showing the CPU utilization of two AWS instances in us-west-2 which are running an identical workload. They are running the CloudNativePG playground, which is a production-like learning and testing environment (all running virtually inside the single ec2 instance, which can … Continue reading
Collation Torture Test versus Debian
Collation torture test results are finally finished and uploaded for Debian. https://github.com/ardentperf/glibc-unicode-sorting The test did not pick up any changes in en_US sort order for either Bullseye or Bookworm 🎉️ Buster has glibc 2.28 so it shows lots of changes – as expected. The postgres wiki had claimed that Jessie(8) to Stretch(9) upgrades were safe. … Continue reading
Waiting for Postgres 18 – Docker Containers 34% Smaller
On February 25, 2025 Christoph Berg committed the patch: This closed Debian bug 927182 which had been opened in April 2019 by Laurence Parry. That bug had raised concerns over the significant size increase of adding LLVM as a requirement to support Postgres JIT functionality. Postgres supports packaging LLVM as a separate optional package without … Continue reading
Testing loadBalancerSourceRanges with CloudNativePG on Azure Kubernetes
This option didn’t seem super widely documented from my initial searches online; it should be able to basically enforce layer 4 ingress/firewall rules at the individual service level. This is a quick test to check if it works. Steps were generated with ChatGPT, and mostly worked. It missed Azure provider registration, but I figure that … Continue reading
Postgres Per-Connection Statistics
I’ve had a wish list for a few years now of observability-related things I’d love to see someday in community/open-source Postgres. A few items from my wish list: As I’ve noted in a few places, there has been slow and steady progress in Postgres over recent years. There’s also plenty of good discussion continuing on … Continue reading
Challenges of Postgres Containers
Many enterprise workloads are being migrated from commercial databases like Oracle and SQL Server to Postgres, which brings anxiety and challenges for mature operational teams. Learning a new database like Postgres sounds intimidating. In practice, most of the concepts directly transfer from databases like SQL Server and Oracle. Transactions, SQL syntax, explain plans, connection management, … Continue reading
Kubernetes Requests and Limits for Postgres
As Joe Drumgoole said a few days ago: so many Postgres providers. Aiven, AWS, Azure, Crunchy, DigitalOcean, EDB, GCP, Heroku, Neon, Nile, Oracle, Supabase, Tembo, Timescale, Xata, Yugabyte… 🤯 I’m sure there’s more I missed. And that’s not even the providers using Postgres underneath services they offer with a different focus than Postgres compatibility. (I … Continue reading
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contact: schneider @ ardentperf.com
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