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Tag: lock

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Here you can find all blog posts about the Tag: lock. 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 […]

Debugging deadlocks in PostgreSQL

by Laurenz Albe | 06.2022
  (Updated 2023-04-07) Even if you understand what a deadlock is, debugging deadlocks can be tricky. This article shows some […]

Disabling autocommit in PostgreSQL can damage your health

by Laurenz Albe | 06.2021
  When analyzing customer's problems, I have seen the mess you can get into if you disable autocommit in your […]

PostgreSQL: Understanding deadlocks

by Hans-Jürgen Schönig | 04.2021
"ERROR: deadlock detected" - message - what should I do? This article explains what this really means and how deadlocks can be prevented.

"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 […]

Be prepared for prepared transactions

by Laurenz Albe | 12.2018
Prepared transactions are disabled in PostgreSQL by default, since the parameter max_prepared_transactions has the default value 0. You don't need […]

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: […]

SKIP LOCKED: Locking for maximum concurrency

by Hans-Jürgen Schönig | 07.2015
Many cool new features have been added to the wonderful PostgreSQL 9.5 release. One of the most exciting ones is definitely SKIP LOCKED.
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