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Category: How To

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

Forking databases - the art of copying without copying

by Ants Aasma | 01.2015
I received a question about how to fork PostgreSQL databases like you can do on Heroku. As I did not […]

Analytics: Lagging entire rows

by Hans-Jürgen Schönig | 10.2014
There is a PostgreSQL feature in the area of analytics which is not widely known: the power to use composite data types along with analytics.

walbouncer: Filtering the transaction log

by Hans-Jürgen Schönig | 10.2014
You might not want to replicate all data to your standbys. walbouncer can filter the transaction log, & replicate only the data needed.

Next stop: Joining 1 million tables

by Hans-Jürgen Schönig | 09.2014
This week I started my preparations for one of my talks in Madrid. The topic is: "Joining 1 million tables". […]

Checking per-memory context memory consumption

by Hans-Jürgen Schönig | 09.2014
Internally PostgreSQL makes use of so called “memory contexts”. What is the idea and what are the advantages? Find out here.

Shrink the storage footprint of PostgreSQL data

by Hans-Jürgen Schönig | 08.2014
Keep the order of your columns in mind to unleash optimization potentials and reduce the table size in your PostgreSQL database.

pg_resetxlog: renamed to pg_resetwal

by Hans-Jürgen Schönig | 08.2014
pg_resetxlog was formerly a feature of PostgreSQL. This has been renamed to pg_resetwal, see the update in the blog.

Optimization issues: Cross column correlation

by Hans-Jürgen Schönig | 07.2014
UPDATED Sept. 2023 - A couple of years ago I stumbled over an interesting PostgreSQL issue which is commonly known as “cross correlation”.

Detecting wrong planner estimates

by Hans-Jürgen Schönig | 07.2014
The PostgreSQL planner optimizes your queries, and mostly does it right. The question is: How to figure out when & where things do go wrong?

CREATE CAST: Casting integer to IP in PostgreSQL

by Hans-Jürgen Schönig | 05.2014
How to store and process IP addresses in an efficient way. To do so PostgreSQL provides us with data types by casting integer.
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