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Tag: query

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Here you can find all blog posts about the Tag: query. You can go back to all blog posts or take a look into our other categories & tags.

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 […]

How to cancel a hanging PostgreSQL query

by Laurenz Albe | 05.2022
  Sometimes a PostgreSQL query takes forever. Usually, it is easy to interrupt (cancel) such a statement, but sometimes it […]

PostgreSQL: Detecting slow queries quickly

by Hans-Jürgen Schönig | 05.2021
UPDATED Mar 2023: How to use pg_stat_statements to detect slow queries - including examples and code - improve PostgreSQL performance

How the PostgreSQL query optimizer works

by Hans-Jürgen Schönig | 03.2021
Get insight into how the PostgreSQL optimizer works and how it speeds up queries. Find out about anti-join & from_collapse_limit.

Tips and tricks to kick-start the Postgres year 2021

by CYBERTEC Guest | 01.2021
Start learning some new Postgres stuff again in 2021 and find some tips: Partial indexing, estimating average row size and more.

Query performance in PostgreSQL 13 RC1

by CYBERTEC Guest | 09.2020
In this blog posting you will learn more about query performance in the new PostgreSQL 13 RC1. Timings measured via ‘pg_stat_statements’

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, […]

Tracking view dependencies in PostgreSQL

by Laurenz Albe | 09.2019
  We all know that in PostgreSQL we cannot drop an object if there are view dependencies on it: [crayon-673a4671973a7266865051/] […]

Implementing “AS OF”-queries in PostgreSQL

by Hans-Jürgen Schönig | 02.2019
Many databases such as Oracle provide "AS OF" queries (timetravel). This blog explains how to do time travel in PostgreSQL.
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