SQL and numeric constants NEW in PostgreSQL 16 – support for underscores in integer and numeric constants! I already wrote about support for different notations in the upcoming PostgreSQL 16. This new major version also implements the SQL:202x standard (draft), allowing you to use underscore separators for integers and numeric constants. Using underscore separators in […]

What is a parallel aggregate? In PostgreSQL, a parallel aggregate refers to a way of processing aggregate functions (such as SUM, AVG, MAX, MIN, etc.) on large amounts of data in a parallel and distributed manner, thereby making the query execution faster. When executing an aggregate query, the database system automatically breaks up the result […]

The CYBERTEC Migrator is a free tool that allows you to easily and quickly migrate from Oracle to PostgreSQL. The CYBERTEC Migrator container can be downloaded at no cost to you. It is a good way for people to move from Oracle to PostgreSQL as speedily as possible. And now, the latest release has a […]

In PostgreSQL 15, a fundamental change took place which is relevant to every user who happens to work with permissions: The default permissions of the public schema have been modified. This is relevant because it might hurt you during application deployment. You need to be aware of how it may affect you. Creating users Many […]

We are thrilled to announce that the FINAL version of pgwatch2 v1.9 is now ready for your production environment! pgwatch provides a secure, open-source, flexible, self-contained PostgreSQL metrics monitoring/dashboarding solution. pgwatch2 v1.9 supports monitoring PG versions 9.0 to 14 out of the box. Upgrade, or install pgwatch today to see how fantastic it really is. […]

© Laurenz Albe 2021 PostgreSQL commit ee28cacf61 has added new options for the target_session_attrs connection parameter. This article explores how the new options can be used to simplify high availability and horizontal scaling solutions. What is target_session_attrs? The PostgreSQL client shared library libpq has support for connection strings to more than one database server: In […]

After exactly half a year (seems to be a pattern already) since the last major release of pgwatch2 Open Source PostgreSQL monitoring tool, I’m glad to announce that another set of useful features and improvements have found their way into the pgwatch2 code repository! The new version is incremented to v1.8.0 and content-wise, it’s mostly […]

© Laurenz Albe 2020 A while ago, I wrote about B-tree improvements in v12. PostgreSQL v13, which will come out later this year, will feature index entry deduplication as an even more impressive improvement. So I thought it was time for a follow-up. Deduplication for B-tree indexes If the indexed keys for different table rows […]

© Laurenz Albe 2020 Most people know that autovacuum is necessary to get rid of dead tuples. These dead tuples are a side effect of PostgreSQL’s MVCC implementation. So many people will be confused when they read that from PostgreSQL v13 on, commit b07642dbc adds support for autovacuuming insert-only tables (also known as “append-only tables”). […]

It’s been exactly half a year since the last major release of the pgwatch2 Open Source PostgreSQL monitoring tool, and I’m glad to announce that another huge set of useful features and improvements have found their way into the pgwatch2 code repository! The new version is incremented to v1.7 and, continuing the naming tradition, I’m […]

Quite often when visiting customers or doing trainings, I see that people are quite happy seeing and learning about some little time-saving PostgreSQL tricks, commands or SQL snippets on the screen and they usually ask to slow down and explain or just say “wow, didn’t know you could do that”. As these tips and tricks […]

© Laurenz Albe 2019 The biggest change in PostgreSQL v12 from the viewpoint of backward compatibility is that recovery.conf has been absorbed into postgresql.conf. This article describes the changes and how you can adapt to them. Getting rid of recovery.conf Up to now, the presence of the file recovery.conf was the trigger for PostgreSQL to […]