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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.

Storing network information

by Hans-Jürgen Schönig | 09.2013
PostgreSQL can handle IP addresses - and network information in general - pretty nicely. Check out this blogpost to learn more.

Monitoring: Keeping an eye on old transactions

by Hans-Jürgen Schönig | 09.2013
To handle transactions PostgreSQL uses a mechanism called MVCC (Multi Version Concurrency Control). The core idea of this machinery is to allow the storage engine to keep more than just one version of the row.

PostgreSQL Vim integration: Finally ...

by Hans-Jürgen Schönig | 09.2013
Importing into Vim is basically not too much of an issue – but, exporting data back to PostgreSQL is more of an issue.

From PostgreSQL directly to Vim

by Hans-Jürgen Schönig | 09.2013
Some (obvious) ideas can struck you when you are just sitting around at the airport or so. This is exactly […]

Speeding up “min” and “max”

by Hans-Jürgen Schönig | 09.2013
In this blog you can read why indexes are a great tool. And how it is possible speeding up a query many times by avoiding a sequential scans,

Reporting: Creating correct output

by Hans-Jürgen Schönig | 08.2013
Creating reports is a core task of every PostgreSQL database engineer or developer. Learn to create reports properly.

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.

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.
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