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Martin Wendler

Martin Wendler

📍 Germany

MySQL: Configure InnoDB ReplicaSet

What is InnoDB ReplicaSet MySQL documentation: "Being based on MySQL Replication, an InnoDB ReplicaSet has a single primary, which replicates to one or more secondary instances. An InnoDB ReplicaSet does not provide all of the features which InnoDB Cluster provides, such as automatic failover, or multi-primary mode. But, it

InfluxDB: Using Docker Compose for InfluxDB

InfluxDB is a "time series database developed by the company InfluxData. It is used for storage and retrieval of time series data in fields such as operations monitoring, application metrics, Internet of Things sensor data, and real-time analytics." Besides installing InfluxDB on a server, or rent the service

Grafana: Use Docker Compose for Grafana

Grafana is a great tool: "Query, visualize, alert on, and understand your data no matter where it’s stored. With Grafana you can create, explore, and share all of your data through beautiful, flexible dashboards." In a modern production environment, I'd have a highly available system

Informix: Using Docker Compose for Informix

Many years ago, at the beginning of my IT carreer, I was a member of the software support (and hotline) for an ERP software. The main database system was (and still is) Oracle, but we supported also Microsoft SQL Server, IBM DB/2 and Informix. I liked Informix, because it

PowerShell: Show size of a folder

When doing a project and watching the progress, e. g. when copying very many files or very large ones, you want to know the size of a folder. On Linux, you can use df: # du -sh /u01 And if you want to keep this information updated, you can use watch

Oracle: Use Docker Compose for Oracle Autonomous Database

Oracle Autonomous Database is "an easy-to-use, fully autonomous database that scales elastically and delivers fast query performance. As a service, Autonomous Database does not require database administration." You can use Oracle Autonomous Database in Oracle Cloud. But if you don't have that, or you prefer to

DB/2: Using Docker Compose for IBM DB/2

Many years ago, at the beginning of my IT carreer, I was a member of the software support (and hotline) for an ERP software. The main database system was (and still is) Oracle, but we supported also Microsoft SQL Server, IBM DB/2 and Informix. DB/2 was always a

Oracle: Using Docker Compose for Oracle 23ai (free)

Oracle 23ai is the latest Oracle database with Long Term Support (LTS). Oracle 21c was an Innovation Release, what means that it's primarily made for testing. And 19c was the LTS release before 23ai. 23ai means year 2023 + artificial intelligence. Unfortunately, we're waiting for 23ai since

Oracle: Timezone upgrade - the easy way

From time to time, countries change their time zone, or the daylight saving time changes (in Germany, we wait for that since years). As some date columns include this information - like TIMESTAMP WITH TIME ZONE, they have to be updated. These updates are called Timezone upgrades. The standard way

MS SQL Server: Use Docker Compose for Microsoft SQL Server

When I started my IT career over 20 years ago, Microsoft was a company which supported their software only on their own platforms. They hated Open Source, and they stated that Linux and Open Source would be only for hobbyists. Fortunately, they changed their mind over the years - my