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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.

ora_migrator: migration from Oracle to PostgreSQL

by Hans-Jürgen Schönig | 04.2018
As some of you might know, CYBERTEC has been helping customers with PostgreSQL consulting, tuning and 24x7 support for many […]

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
When running PostgreSQL on a production system, it might happen that you are facing table bloat. As you might know […]

Window function: Why first_value and last_value are not bugs

by Hans-Jürgen Schönig | 04.2018
SQL is a must, if you want to be a Data Analyst or a Data Scientist. However, every once in […]

PostgreSQL: Speeding up analytics and window functions

by Hans-Jürgen Schönig | 03.2018
This post will deal with how to speed up analytics and window functions in PostgreSQL. As a professional PostgreSQL support […]

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
The COPY command in PostgreSQL is a simple way to copy data between a file and a table. COPY can […]

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

by CYBERTEC Guest | 02.2018
Pgbench is a very well-known and handy built-in tool that Postgres DBAs can use for quick performance benchmarking. Its main […]

Preparing data for machine learning in PostgreSQL

by Hans-Jürgen Schönig | 01.2018
You have probably noticed that everyone is talking about Artificial Intelligence and Machine Learning these days. Quite rightly, because it […]

Security matters - hiding a table column - restrict column access

by CYBERTEC Guest | 12.2017
By Kaarel Moppel - Restricting column access - Something from the security realm this time - normally this side of […]
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