Category: How To

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Detecting fraud: Benford's law

by Hans-Jürgen Schönig | 01.2014

Benford's law is a mechanism, which is widely used in many fields. Especially accounting fraud can be detected nicely using this simple law of mathematics.

How To

Fed up with long WHERE-clauses?

by Hans-Jürgen Schönig | 12.2013

What if you want to compare dozens of columns with each other in PostgreSQL? Find out how to do it right here.

How To

PostgreSQL shutdown modes

by Hans-Jürgen Schönig | 12.2013

PostgreSQL has three shutdown modes - smart, fast, immediate. Check out this blogpost to learn more about all of them.

How To

Tracking changes in PostgreSQL

by Hans-Jürgen Schönig | 12.2013

UPDATED 2023 - How to track changes made to tables in PostgreSQL - instructions how to use a generic changelog trigger for tracking changes.

How To

Making random() deterministic - random generator in PostgreSQL

by Hans-Jürgen Schönig | 12.2013

How to reproduce a random sequence of numbers. Reset the random generator to restart a certain value in PostgreSQL. random()

How To

PostgreSQL: Finding Christmas presents

by Hans-Jürgen Schönig | 12.2013

In this blog we are talking about KNN-search. KNN-search has been made for finding something close to what you are looking for.

How To

effective_cache_size: Better set it right

by Hans-Jürgen Schönig | 11.2013

effective_cache_size can have a serious impact on execution plans and change things dramatically. See what kind of difference it can make.

How To

Operator classes explained

by Hans-Jürgen Schönig | 11.2013

In this blog we are tallking about the topic operator class. We will show you some strategies for your database.

How To

Common security issues prior to PostgreSQL 15

by Hans-Jürgen Schönig | 10.2013

UPDATED July 2023: How to avoid security issues in PostgreSQL prior to v15 due to the public schema. Repair the problem.

How To

Reducing space consumption

by Hans-Jürgen Schönig | 10.2013

After digging through some customer source code yesterday I thought that it might be worth publishing a post about space consumption and enum types. It seems to be quite common to store status information as text fields. This is highly inefficient.

How To