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Tag: concurrency

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

Row locks in PostgreSQL

by Laurenz Albe | 04.2023
  The PostgreSQL documentation has some information about row locks. But typically, you cannot see them in pg_locks, and not […]

ALTER TABLE ... ADD COLUMN … done right in PostgreSQL

by Hans-Jürgen Schönig | 08.2022
Running ALTER TABLE … ADD COLUMN can have side effects which have the potential to cause serious issues in production. […]

Transaction anomalies with SELECT FOR UPDATE

by Laurenz Albe | 06.2022
  I was recently confronted with a nice example of how adding FOR UPDATE to a query can introduce transaction […]

Fixing out-of-sync sequences in PostgreSQL

by Hans-Jürgen Schönig | 08.2021
Creating auto increment columns in PostgreSQL is easy. Simply use two pseudo data types serial and serial8, respectively, then PostgreSQL […]

Subtransactions and performance in PostgreSQL

by Laurenz Albe | 03.2020
  (Last updated on 2023-01-24) Recently, while troubleshooting PostgreSQL performance problems, I ran into problems with subtransactions twice. So I […]

"LOCK TABLE" can harm your database's health

by Laurenz Albe | 03.2019
  Many people know that explicit table locks with LOCK TABLE are bad style and usually a consequence of bad […]

What's in an xmax?

by Laurenz Albe | 04.2018
xmax is a PostgreSQL system column that is used to implement Multiversion Concurrency Control (MVCC). The documentation is somewhat terse: […]

Monitoring: Keeping an eye on old transactions

by Hans-Jürgen Schönig | 09.2013
To handle transactions PostgreSQL uses a mechanism called MVCC (Multi Version Concurrency Control). The core idea of this machinery is […]
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