Tag: optimizer

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Reproducible builds: a PostgreSQL query optimization example

by Christoph Berg | 07.2023
This post shows how to optimize a slow query that came out of the Reproducible Builds project. The Reproducible Builds […]

Subqueries and performance in PostgreSQL

by Laurenz Albe | 07.2023
  SQL allows you to use subqueries almost anywhere where you could have a table or column name. All you […]

Memory context: private memory management in PostgreSQL

by Laurenz Albe | 06.2023
  PostgreSQL uses shared memory for data shared between processes. With the exception of the dynamic shared memory segments used […]

Forcing a join order in PostgreSQL

by Laurenz Albe | 05.2023
  Different from many other database systems, PostgreSQL does not support query hints. That makes it difficult to force the […]

Rewrite OR to UNION in PostgreSQL queries

by Laurenz Albe | 11.2022
  In my article that reviles OR, I showed how in certain cases, it is possible to rewrite OR in […]

How the PostgreSQL query optimizer works

by Hans-Jürgen Schönig | 03.2021
Just like any advanced relational database, PostgreSQL uses a cost-based query optimizer that tries to turn your SQL queries into […]

PostgreSQL: CREATE STATISTICS - advanced query optimization

by Hans-Jürgen Schönig | 02.2021
PostgreSQL query optimization with CREATE STATISTICS is an important topic. Usually, the PostgreSQL optimizer (query planner) does an excellent job. […]

PostgreSQL: ANALYZE and optimizer statistics

by Hans-Jürgen Schönig | 02.2021
Our PostgreSQL 24x7 support team recently received a request from one of our customers who was facing a performance problem. […]

Join strategies and performance in PostgreSQL

by Laurenz Albe | 06.2020
  (Updated 2023-02-24) There are three join strategies in PostgreSQL that work quite differently. If PostgreSQL chooses the wrong strategy, […]

7 things that could be improved in PostgreSQL

by CYBERTEC Guest | 04.2020
By Kaarel Moppel - UPDATED by Laurenz Albe 06.07.2023 - See what progress has been made What are PostgreSQL's weaknesses? […]
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