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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.

What's in an xmax?

by Laurenz Albe | 04.2018
xmax is a PostgreSQL system column that is used to implement Multiversion Concurrency Control (MVCC). The documentation is somewhat terse: […]

idle_in_transaction_session_timeout: Terminating idle transactions in PostgreSQL

by Hans-Jürgen Schönig | 04.2018
Long PostgreSQL transactions can cause table bloat. idle_in_transaction_session_timeout limits the duration of a transaction to prevent bloat

Window function: Why first_value and last_value are not bugs

by Hans-Jürgen Schönig | 04.2018
PostgreSQL can be used for more than just trivial queries. A look into what a window function does: first_value and last_value in PostgreSQL.

PostgreSQL: Speeding up analytics and window functions

by Hans-Jürgen Schönig | 03.2018
How to improve speed is by rearranging window functions in a clever way: some clever optimization can give you better database performance.

Four reasons why VACUUM won't remove dead rows from a table

by Laurenz Albe | 03.2018
Why vacuum? Whenever rows in a PostgreSQL table are updated or deleted, dead rows are left behind. VACUUM gets rid […]

COPY in PostgreSQL: Moving data between servers

by Hans-Jürgen Schönig | 03.2018
More than copy data between a file and a table: a pretty cool feature was added to PostgreSQL. You can send data directly to the UNIX pipe.

A formula to calculate "pgbench" scaling factor for target DB size

by CYBERTEC Guest | 02.2018
This blog post shows you how to calculate pgbench scaling factors for target database size in PostgreSQL.

Preparing data for machine learning in PostgreSQL

by Hans-Jürgen Schönig | 01.2018
Most of the code related to machine learning available today is overloaded. Why not prepare the data in SQL? It's easier & more flexible.

Security matters - hiding a table column - restrict column access

by CYBERTEC Guest | 12.2017
How to restrict column access. The best option for hiding table columns in a non-destructive way is the rule system.

Creating 1 million users in PostgreSQL

by Hans-Jürgen Schönig | 12.2017
“How many users can you have in PostgreSQL?” - “Well, as many as you want.” Here's how to easily create a large number of database users.
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