ERR_CONNECTION_RESET: how to fix the 101 error in Chrome, etc.

If you can’t connect to the website you want to access, an error message will be displayed listing possible causes. Sometimes these aren’t of much help. For example, the message “ERR_CONNECTION_RESET” simply reveals that the connection has been reset, however the reasons why and possible solutions are not given. We explain why the error occurs and how to fix ERR_CONNECTION_RESET.

ERR_CONNECTION_CLOSED: How to fix the connection error

If Chrome displays the message "ERR_CONNECTION_CLOSED" instead of the website you want to access, it means that the contacted server has interrupted the connection. Reloading the URL is often not enough to fix the problem. Unfortunately, determining the source of the error is anything but a simple task. To fix the "ERR_CONNECTION_CLOSED" error, you need a good amount of patience.

HTTP 408: how to fix the timeout error

Permanent availability is one of the most important things when it comes to a website. However, even the best technical conditions do not offer a 100% guarantee that a website will constantly run smoothly. Connection errors like HTTP error 408 regularly present websites with minor and major difficulties, especially since the causes are often found on the client side. Our guide looks at the causes...

Databases – why do you need them and what kinds are there?

Databases are a fundamental part of our information society today. They organize electronic data and regulate access to it. Databases have a wide range of applications, both commercial and private. Each database system has a database management system based on a specific database model. While the history of the database began with the hierarchical model, today the relational database model is the...

What is Chrome 68?

Early next month, Chrome 68 will be launched and the new browser will distrust all webpages that do not have HTTPS encryption as “not secure”. This is a big step in the recent trend towards emphasizing user safety on the internet, a not entirely selfless strategy from Google. In this guide, we will explain what changes will be made, why they are happening, and how you can prepare your website...

Less redundancy thanks to database normalization

Redundancies occur when various details are combined in a single database table. These redundancies use up storage capacity and prevent efficient data processing. The relational database model offers strategies for splitting datasets among several linked tables, in a process called database normalization. Find out what it’s all about with practical examples.


OUTER JOINs are queries that take place across several database tables. There are LEFT OUTER JOINs, RIGHT OUTER JOINs and FULL OUTER JOINs. Each of these JOIN types has a larger result set than the INNER JOIN. But what exactly is the difference between the individual types? Here, we will distinguish OUTER JOINs from INNER JOINs, compare the different subtypes of OUTER JOINs and explain how they...

INNER JOIN: definition and application

The INNER JOIN is the most important JOIN type in the relational database model. If you want to query database tables in a group, you would usually use INNER JOINs based on equality relationships between primary and foreign keys. We will show you how to use INNER JOINs in practice, delineate the JOIN type from OUTER JOINs, and also deal with the different subtypes of INNER JOINs.

SQL JOIN – queries across multiple data tables

A major strength of the relational database model is that information is stored in separate database tables structured according to semantic relationships. This concept, known as normalization, is the basis for data storage that is as redundancy-free as possible, but requires a mechanism with which data from different tables can be merged for queries. The different JOIN types provide users with...

In-memory databases: the storage of big data

In-memory databases enable big data to be analyzed and made available in real time. The quick access speeds are made possible by storing the data on the working memory – hence the name in-memory database. Traditional databases, on the other hand, are based on the method of storing data on the hard disk. How do in-memory databases differ from traditional database systems? And what are the go-to...