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Hans-Jürgen Schönig

Founder & CEO of CYBERTEC
Hans-Jürgen Schönig has worked with PostgreSQL since the 90's. He is the CEO and technical lead of CYBERTEC PostgreSQL International, a market leader in the field. He's served countless customers around the globe since the year 2000. He is also the author of the well-received "Mastering PostgreSQL" book series, as well as several other books about PostgreSQL replication and administration.

Articles by Hans-Jürgen Schönig

Table bloat revisited: Making tables shrink in PostgreSQL

by Hans-Jürgen Schönig | 08.2013
UPDATED Understand table bloat. Why deleting data from a table in a PostgreSQL database does not always shrink files on disk.

Detecting table bloat in PostgreSQL

by Hans-Jürgen Schönig | 08.2013
If your PostgreSQL database is badly structured, you might face some table bloat. Figure out if a table is bloated or not.

Common mistakes: UNION vs. UNION ALL

by Hans-Jürgen Schönig | 08.2013
In my role as a PostgreSQL consultant and trainer there are a couple of issues, which pop up on a […]

Reducing the number of columns with bit

by Hans-Jürgen Schönig | 08.2013
How to reduce the number of columns using bitfields in PostgreSQL. "bit” can be used just as a normal char data type.

Time in PostgreSQL: Outer joins

by Hans-Jürgen Schönig | 08.2013
UPDATED Aug 2023: How to use “generate_series” in an outer join: Use PostgreSQL to aggregate data on an hourly basis.

Time in PostgreSQL: The simple way

by Hans-Jürgen Schönig | 08.2013
UPDATED Aug. 2023: How to process time in PostgreSQL: timeseries & generate_series, day constants, add and subtract from a time interval.

Transactional DDLs – a message to non-PostgreSQL users

by Hans-Jürgen Schönig | 06.2013
In this blog we will talk about transactional DDL's in PostgreSQL vs other database systems. Find out more information.

Functions: The most widely ignored performance tweak

by Hans-Jürgen Schönig | 05.2013
A PostgreSQL function performance can be marked as follows: VOLATILE, STABLE, IMMUTABLE or [NOT] LEAKPROOF. Undestand why.

CREATE TABLE – the fancy way with LIKE

by Hans-Jürgen Schönig | 05.2013
The LIKE keyword: Using LIKE is especially useful if you want to clone tables which have dozens of indexes and constraints.

Kostal Pico to PostgreSQL

by Hans-Jürgen Schönig | 05.2013
As there is hardly code available on the net showing how to access Kostal Pico, I decided to publish this one.
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