© Laurenz Albe 2022 Sometimes a PostgreSQL query takes forever. Usually, it is easy to interrupt (cancel) such a statement, but sometimes it can turn into a problem, and a query cannot be canceled. This article discusses what might be the cause. I’ll also show you a trick how to solve the problem (not for […]

Just like any advanced relational database, PostgreSQL uses a cost-based query optimizer that tries to turn your SQL queries into something efficient that executes in as little time as possible. For many people, the workings of the optimizer itself remain a mystery, so we have decided to give users some insight into what is really […]

I decided to start out this year by looking into my notes from last year and extracting from them a small set of Postgres tips for you. This might not be, strictly speaking, fresh news… but I guess the average RAM of tech workers is about 64KB or so nowadays, so some repetition might not […]

© Laurenz Albe 2020 (Updated 2023-02-24) There are three join strategies in PostgreSQL that work quite differently. If PostgreSQL chooses the wrong strategy, query performance can suffer a lot. This article explains the join strategies, how you can support them with indexes, what can go wrong with them and how you can tune your joins […]

(Last updated 18.01.2023) When digging into PostgreSQL performance, it is always good to know which options one has to spot performance problems, and to figure out what is really happening on a server. Finding slow queries in PostgreSQL and pinpointing performance weak spots is therefore exactly what this post is all about. There are many […]

  PostgreSQL query tuning is our daily bread at CYBERTEC, and once you have done some of that, you’ll start bristling whenever you see an OR in a query, because they are usually the cause for bad query performance. Of course there is a reason why there is an OR in SQL, and if you […]