Databases

A common question is whether PostgreSQL is an SQL or NoSQL database (it’s not) – this article explains why. What is SQL SQL (pronounced sequel or S-Q-L) is the Structured Query Language – a language used by many relational database systems for querying data. It is also increasingly being used for defining data schemas in data analytics applications where the data is not stored in a database but is arriving as a data stream. Data defined and queried by SQL is structured tables that can have relationships between records – for example … Read more

PostgreSQL is one of the most popular database systems in use today. GUIs make working with data in PostgreSQL simpler for beginners – here are the best free GUIs you can use on Linux in 2022. What is PostgreSQL PostgreSQL is an object-relational database management system (ORDBMS) for storing structured data. It provides a networked database server that can be used as the backend for your mobile apps, APIs, and webapps. It is also used for storing data for processing in analytics and data science. It’s free to … Read more

This tutorial will show you how to check that the PostgreSQL Server service is running on your Linux system. To install PostgreSQL follow our tutorial here. Checking PostgreSQL is Running on Ubuntu/Debian To check whether the PostgreSQL server service is running successfully on your Debian or Ubuntu system, run: Checking the Firewall By default PostgreSQL runs on port 5432 and is not restricted by host name. When installing PostgreSQL on Ubuntu, usually a firewall rule will be created automatically allowing access to the database server. You can confirm … Read more

This article will instruct you how to update the PostgreSQL database server on Linux – Redhat, Ubuntu, Debian, and Arch Linux. If you’re looking to install PostgreSQL server on your Linux system, follow our instructions here. Take Care, and Back Up! Note that this article is about updating the PostgreSQL package from your software repository. This will not upgrade to the next major release. Before you do update, however check which version will be installed and ensure it is compatible with the software you are connecting to the database. … Read more

This article will show you how to safely upgrade the PostgreSQL database server to the latest version on your Linux system. First, Back Up Your Databases! Before making any changes to your system, you should perform a full backup – that way if something goes wrong, you can roll back to a working version quickly. At the very least, make sure that you’ve backed up your PostgreSQL Databases to protect from data loss. What is a Major/Minor Release? A major release is an update that greatly changes the functionality or … Read more

This short tutorial will show you how to start, stop, and restart PostgreSQL servers on your Linux system. PostgreSQL is a flexible database system that allows you to run multiple versions of the server software on the same host. This can get a bit confusing, but thankfully PostgreSQL includes all of the tools you need to make sense of things and control each server individually. How to Start PostgreSQL Service/Server To start the default or primary PostgreSQL server on your system, simply run the following … Read more

This post will explain how user accounts by default work in PostgreSQL, and how you can change the default password. PostgreSQL works a bit differently to other database servers like MySQL when it comes to the default behaviour of user accounts, so read on to find out how to manage access as the default PostgreSQL admin user. PostgreSQL uses the system users The default PostgreSQL configuration uses ident for authentication – this method uses the hosts operating systems usernames and compares them against the permissions stored for each database. This means … Read more

This article will demonstrate how to list the PostgreSQL clusters on your Linux system, and how to switch the active cluster. PostgreSQL is one of the most popular relation database servers. Multiple versions can be installed on the same host, so being able to switch between them is pretty useful. Read on to find out how to do it. What is a Cluster A PostgreSQL cluster is a collection of PostgreSQL databases with a shared configuration, managed. This configuration includes things like the executable that manages the … Read more

This tutorial will show you how to import data from a CSV file into a PostgreSQL database table. What is a CSV File A CSV (Comma Separated Values) file is a text file that contains tabulated information. The rows in this data each take up a line in the text file, while the values in each column on each row are separated by a comma – hence, comma-separated. CSV files are versatile. Because the data within is stored as plain text, they can be opened … Read more

This tutorial will show you how to export, import, and back up your PostgreSQL clusters and databases. You should regularly back up. It’s one of the most important things you can do as a sysadmin, developer, and even a hobbyist. Losing your data is detrimental to business, and your projects. Losing your family photos sucks too. This article demonstrates the various way to import and export PostgreSQL data so that it can be backed up. This process should be done regularly (or automated!), and performed … Read more