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Tag: under the hood

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

VACUUM does not shrink my PostgreSQL table

by Hans-Jürgen Schönig | 10.2022
Did you ever wonder why VACUUM does not shrink PostgreSQL data files? Learn all the most useful secrets of VACUUM.

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

by Hans-Jürgen Schönig | 08.2022
Running ALTER TABLE … ADD COLUMN can cause serious issues in production. Understand how to cleanly change PostgreSQL data structures.

Cleaning up a large number of BLOBs in PostgreSQL

by Hans-Jürgen Schönig | 04.2021
Basically, there are two ways to delete BLOBs (binary large objects):Change the PostgreSQL configuration or delete the BLOBs in chunks.

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.

PostgreSQL: What is a checkpoint?

by Hans-Jürgen Schönig | 02.2021
How to use checkpoints and checkpoint tuning, and how PostgreSQL writes data, database internals explained.

Is UPDATE the same as DELETE + INSERT in PostgreSQL?

by Laurenz Albe | 12.2020
  Introduction We know that PostgreSQL does not update a table row in place. Rather, it writes a new version […]

effective_cache_size: A practical example

by Hans-Jürgen Schönig | 07.2020
Few people know what effective_cache_size really does in PostgreSQL. Let me share some more insights and a practical example.

Deduplication in PostgreSQL v13 B-tree indexes

by Laurenz Albe | 06.2020
  A while ago, I wrote about B-tree improvements in v12. PostgreSQL v13, which will come out later this year, […]

How PostgreSQL estimates parallel queries

by Hans-Jürgen Schönig | 10.2019
How to understand parallel queries - estimate the cost of sequential scans and parallel sequential scans in PostgreSQL

Composite/ combined indexes vs. separate indexes in PostgreSQL

by Hans-Jürgen Schönig | 07.2019
What is more beneficial: Using separate or combined indexes in your PostgreSQL database? Speed performance by understanding index scans.
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