Un événement communautaire Cette année encore 2ndQuadrant aide la communauté PostgreSQL en France en étant Partenaire du pgDay 2017 à Paris Cette journée de conférences, en anglais exclusivement, est une opportunité unique d’en apprendre plus sur le fonctionnement et l’activité de PostgreSQL. Sécurité, benchmarks, supervision, roadmap pour la version 10, réplication, … de nombreux sujets, variés...

This is the third and last part of blog articles dedicated to pg_rewind. In the two previous articles we have seen how pg_rewind is useful to fix split-brain events due to mistakes in the switchover procedures, avoiding the need of new base backups. We have also seen that this is true for simple replication clusters, where more standby nodes are involved.

In the previous blog article we have seen how pg_rewind works with a simple HA cluster, composed of a master node replicating to a standby. In this context, an eventual switchover involves just two nodes that have to be aligned. But what happens with HA clusters when there are several (also cascading) standbys? Now, consider a more complicated HA cluster, composed of a master with two standbys...

pgFincore 1.2 est une extension PostgreSQL pour auditer et manipuler le cache de pages de données du système d’exploitation. L’extension a déjà une histoire de 7 ans d’utilisation, avec des évolutions correspondant aux besoins de production. Télécharger ici la dernière version 1.2, compatible avec PostgreSQL 9.6. https://www.2ndquadrant.com/wp-content/uploads/2016/09/pgfincore_drawer.ogv Cache de...

Since PostgreSQL 9.5, pg_rewind has been able to make a former master follow up a promoted standby although, in the meantime, it proceeded with its own timeline. Consider, for instance, the case of a switchover that didn’t work properly. Have you ever experienced a "split brain" during a switchover operation? You know, when the goal is to switch the roles of the master and the standby, but instead...

Last week I was pleased to attend Code Sprint 2016 in Paris, organised by the OSGeo Foundation: it has been an opportunity for many GIS users from all over the world to get together, discuss and actively work on many open tasks of some of the major open source frameworks on GIS. PostGIS was obviously one of the projects involved in the Code Sprint. Some background information first. A few months...

A few weeks ago I asked one of my colleagues why I should learn PostgreSQL. Harald’s answer was: “To start any new journey of learning, asking ‘why’ is an excellent question. It gives us both a direction to send us on our way and an expected destination. Without a clear path to follow, our brains tend to filter out new information.” He then came up with some very valid reasons to learn PostgreSQL...

The introduction of the JSONB data type in PostgreSQL, definitely makes the “NoSQL” side of this relational DBMS come out: this introduction meets the requirements of all those who prefer a data structure in a “key-value” array, dictionary style (widely used in the field of development) and, at the same time, ensures all the advantages of a relational database. PostgreSQL 9.2 already provided for...

Written by Giuseppe Broccolo Since PostgreSQL 9.3, it is possible to update and insert into views directly, so long as the view refers to only one underlying table. PostgreSQL 9.4 allows us to use the CHECK clause for INSERTs into updatable views. For example, consider a table composed of just one integer column; and consider two views, one on numbers divisible by 2 and one on numbers divisible by...