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Daniel Westermann

New predefined roles for PostgreSQL 14

By | Database Administration & Monitoring | No Comments

Time is moving fast and PostgreSQL 14 is already in beta 2. PostgreSQL 14 will ship with a lot of new features and in this post will look at a smaller one: There are three new predefined roles: pg_read_all_data, pg_write_all_data and pg_database_owner. While it seems to be obvious what the first two roles are about, the third one might sound strange at the beginning. Let’s have a look.

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Karsten Lenz

Recurring PostgreSQL Installations using RHEL 8 and Clones

By | Database Administration & Monitoring | No Comments

This Blog is a follow up uf one of my older Blogs and my Article at heise.de: Blog at dbi-services.com Article at heise.de For RHEL 8 at its clones like AlmaLinux, CentOS, Oracle Linux and Rocky Linux i have written a shell script to automated recurring setups. This is used for a cloud project using own virtual machines. The script automates the steps i have described at my article at heise.de. The script has an…

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Oracle Team

PostgreSQL on Oracle free tier ARM

By | Oracle, Postgres | 4 Comments

By Franck Pachot . This follows the previous post about the Oracle Cloud ARM compute shape just announced on May 25th. The processor is ARM v8.2 with LSE (atomic instructions) and PostgreSQL can benefit from it (see Dramatical Effect of LSE Instructions for PostgreSQL on Graviton2 Instances). I have installed GCC 11 in the previous post, on a Oracle Linux 7.9 image with comes with GCC 7. If you installed the Ubuntu 20.4 image, you…

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Daniel Westermann

Why is the default postgres database slightly larger than template1?

By | Database Administration & Monitoring | No Comments

You probably know that a fresh initialized PostgreSQL cluster comes with three databases by default: template0, template1, and postgres. If you want to know why they are there, and what their purpose is, check this post. In this post we’ll look at something you may never have noticed: Why is the postgres database, even after a fresh initdb, slightly larger than template1 and template0?

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Open source Team

PostgreSQL on AWS Graviton2: CFLAGS

By | AWS, Postgres | No Comments

By Franck Pachot . In a previous post I’ve compiled PostgreSQL with GCC 7 and GCC 11 with the default options and checked that the ARM v8.2 features were used. However it may not be so simple: PostgreSQL ./configure defines gcc flags to produce a binary that is compatible with older versions of ARM. This means that it may not use the LSE feature introduced in ARM v8.1 With this, the default compilation (-march=armv8-a) doesn’t…

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Daniel Westermann

Getting started with Citus – Setting up a four node cluster

By | AWS, Database Administration & Monitoring | No Comments

One issue with traditional database systems like PostgreSQL is, that you cannot easily scale vertically. Of course you could add read replicas and offload read operations, but that either requires changes in the application, or putting something in front that understands the PostgreSQL dialect and automatically routes writes to the primary and spreads reads across one or more replicas (e.g. pgpool-II). But even if you have something in place, you need to deal with replications…

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Daniel Westermann

PostgreSQL: set_config and current_setting

By | Database Administration & Monitoring | No Comments

PostgreSQL comes with a rich set of administrative functions for various use cases. There are functions to control parameters, there are functions for index maintenance, others are for recovery and or backup control and there is much more. In this post we’ll look at how you can use the build-in functions to set and get parameters without touching the configuration file (or setting parameters at the cluster, database and user level). In the posts that…

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Daniel Westermann

Building a PostgreSQL EC2 AMI for testing the latest commits

By | AWS, Database Administration & Monitoring | No Comments

Testing the latest features or bug fixes in PostgreSQL can easily be done by pulling the latest commits from the git repository and compile PostgreSQL from source code. I am doing that frequently on my local sandbox VM but this becomes limited when I need more CPUs or more memory. This is where the public cloud really shines, as you can easily deploy new VMs, do your tests and get rid of it afterwards with…

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