PostgreSQL: a closer look at the object-relational database management system

The PostgreSQL database management system, also known to many as Postgres, has many decades of development behind it. It originally started as a project at Berkeley University in California. Today, the open source database continues to defy solutions from commercial competitors, since the development team is constantly working on its functionality and performance. But what exactly is PostgreSQL?...

Golang: the simple programming language from Google

Google is best known for its search engine, but also for services like AdWords, Maps, or Gmail. Since 2012, the mega-corporation has had its own programming language in its product range: Go. Also known under the name Golang, it has drawn attention to itself through its simplicity. But how does it differ from established representatives like C++ or JavaScript? And when does it make sense to...

What is RFID?

RFID, technology to identify objects with the help of electromagnetic waves, is revolutionizing logistics processes and merchandise management systems. Concepts for automating production processes in the context of the future project Industry 4.0 also rely on RFID systems. We explain to you how radio frequency identification works and what fields of application there are.

Apache Hadoop: distributed storage architecture for data quantities

Are you looking to execute complicated computing processes with large amounts of data? This is exactly what the Big Data framework, Hadoop, focuses on. The open source Apache software offers a Java based frame with which various Big Data applications on computer clusters can be parallelized. Hadoop’s modular expandability, which offers users an enormous range of functions, is a particularly...

What is the ICMP?

In the background, numerous protocols ensure that communication and data transmission work in computer networks. As the most prominent representative, the Internet Protocol plays a fundamental role. Without its’ various extensions and additions they would be nowhere near as versatile, as is the case in the current protocol. Thanks to the possibilities offered by ICMP protocol error messages and...

Multicast: Point-to-multipoint connection for efficient data transfer

Bandwidth plays an important role when sending data over IP networks. This is especially true when packets are being sent to more than one recipient, which can result in overloads preventing the data from being sent problem-free. Therefore, IP multicast was developed early on to enable data to be sent simultaneously to multiple destination nodes.

ASCII - American Standard Code for Information Interchange

Every day we work with text on PCs, smartphones, tablets and other computer equipment using our keyboards. We expect letters, numbers, and characters to appear on the monitor before us. The fact is that there is a decades-old coding system behind this everyday function. Since the 1960s, ASCII has determined how computers interpret our input. We have prepared a practical ASCII table to help you...

Windows blue screen (BSOD): How to cure the error

The infamous blue screen of death usually shows up without any warning. It’s an important indicator of internal problems with hardware, software, or drivers. If Windows can no longer be run as a result of such a problem, then the forced shutdown takes place in the form of a blue screen containing an error message. This may cause unsaved files and documents to be lost. The most important thing with...

Introduction to PowerShell – Tools for system administrators

For a long time, Windows users were left behind when it came to command interpreters because the command prompt did not allow full access to operating system internal components, and scripting also offered only limited possibilities. This should finally change thanks to Microsoft’s PowerShell. The cross-platform program not only does much better than cmd.exe, it also provides remote computer...

SNMP tutorial: how snmpwalk and snmpget work

The central monitoring and managing of network devices such as routers, switches, or firewalls is often carried out using the Simple Network Management Protocol (SNMP). Both snmpwalk and snmpget tools use SNMP messages, for example, to retrieve data sets of selected network participants. In our SNMP tutorial, we show what these two command line tools can do and how data retrieval works.