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Category: How To

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Conditional foreign keys and polymorphism in SQL: 4 Methods

by Laurenz Albe | 08.2023
  This article is about the notoriously difficult problem of “conditional foreign keys”. In object-oriented programming languages, polymorphism is a […]

Indexing "LIKE" in PostgreSQL and Oracle

by Laurenz Albe | 08.2023
© Laurenz Albe 2023 Unless you use the binary collation, creating a b-tree index to support a LIKE condition in […]

Why does my pg_wal keep growing?

by Laurenz Albe | 08.2023
  "Why does my pg_wal keep growing?" That's a question I keep hearing again and again. It is an urgent […]

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 […]

PostGIS, ArcGIS Enterprise and the Tour de France route

by Florian Nadler | 07.2023
How to analyze a stretch of the Tour de France in a hybrid environment, ArcGIS Enterprise & PostGIS - we’ll utilize PostGIS native geometry types instead of ESRI geometry types to analyze this challenging stage both in ArcGIS Pro and PostGIS

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 […]

View Access Logging - Fix it in PostgreSQL

by CYBERTEC Guest | 07.2023
By Kirk Wolak Continuous Improvement is an important part of reducing technical debt. Over 30 years our active database has […]

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 […]

Unexpected downsides of UUID keys in PostgreSQL

by Ants Aasma | 06.2023
There are various compelling reasons to use universally unique identifiers (UUID) as primary keys. Two examples are: To be able […]

Use HOT, so CLUSTER won't rot in PostgreSQL

by Laurenz Albe | 06.2023
CLUSTER is sometimes the last resort to squeeze performance out of an index scan. Normally, you have to repeat CLUSTER […]
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