Martin's Blog

Latest — 16 May 2025

The Ten Commandments for DBAs

I recently read a great blog entry from Fritz Lechnitz, who wrote about the Ten Commandments for a SQL Server DBA. As I am - and mostly was over many years - an Oracle DBA, who had some excursions to other RDBMS - SQL Server, DB/2, Informix, MySQL, PostgreSQL

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Oracle: How to solve ORA-06520

After migrating an Oracle database to a new server, ORA-06520 occurs. This is how to solve it.

Oracle: How to solve ORA-28040

This is how to solve connection error ORA-28040

Oracle: Use CheckMk for Oracle Database monitoring

This is how to easily use CheckMk for Oracle monitoring

InfluxDB: Use Docker Compose for InfluxDB 3 Core

This is how to create an InfluxDB 3 container in Docker, using docker compose.

Valkey: Use Docker Compose for Valkey as alternative to Redis

As Redis changed its license to a proprietary one, the Linux Foundation created a fork called Valkey, which has a BSD license. "Valkey is an open source high-performance key/value datastore that supports a variety of workloads such as caching, message queues, and can act as a primary database.

MariaDB: use Docker Compose for MariaDB

Here's an easy way how to set up MariaDB using Docker Compose

Oracle: DataPatch fails with error PLS-00302

This is how to solve PLS-00302 when executing DataPatch

Oracle: Create or drop database link for/from different schema

You can't create a database link for another user than the one you logged in. Neither you can drop it. Here's a workaround...

Oracle: Time bombs

This post shows some time bombs in Oracle environments