replication Archives - 2ndQuadrant

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PostgreSQL 13: Don’t let slots kill your primary

July 30, 2020/0 Comments/in 2ndQuadrant, Alvaro's PlanetPostgreSQL, PostgreSQL 13 /by Álvaro Herrera

One of the interesting new features in PostgreSQL for some time now is the ability to control removal of WAL files using replication slots. The dark side is that replication slots can cause disks to fill up with old WAL, killing the main production server. In this article I explain PostgreSQL replication slots, and how a new feature in PostgreSQL 13 helps prevent this problem.

PG Phriday: It’s the End of the World as We Know it (and Postgres is Fine)

July 3, 2020/0 Comments/in Shaun's PlanetPostgreSQL /by Shaun Thomas

On June 17th, I gave a presentation on Postgres Monitoring to the Chicago Postgres User Group. Since MeetUp doesn’t allow uploading slides, I figured I’d convert my presentation into a more comprehensive writeup. Enjoy! Why Monitor So, what are the finer points of Disaster Mitigation? Let’s start with a few questions: What broke? When did […]

PG Phriday: 10 Things Postgres Could Improve – Part 2

June 19, 2020/0 Comments/in Shaun's PlanetPostgreSQL /by Shaun Thomas

Last week, we examined Postgres XID wraparound complications in greater depth to see exactly how easily they can surprise even prepared enterprises. But we also found the real problem areas and how to mitigate them specifically. In this continuing series to plumb the depths of Postgres constructively, we’re going to focus on some of the […]

Failover slots for PostgreSQL

June 8, 2020/8 Comments/in Craig's PlanetPostgreSQL /by craig.ringer

Logical decoding and logical replication is getting more attention in the PostgreSQL world. This means we need it working well alongside production HA systems – and it turns out there’s a problem there. Replication slots are not themselves synced to physical replicas so you can’t continue to use a slot after a master failure results […]

How to Automate PostgreSQL 12 Replication and Failover with repmgr – Part 2

February 11, 2020/52 Comments/in PostgreSQL, repmgr, Sadeq's PlanetPostgreSQL /by 2ndQuadrant Press

This is the second installment of a two-part series on 2ndQuadrant’s repmgr, an open-source high-availability tool for PostgreSQL. In the first part, we set up a three-node PostgreSQL 12 cluster along with a “witness” node. The cluster consisted of a primary node and two standby nodes. The cluster and the witness node were hosted in […]

How to Automate PostgreSQL 12 Replication and Failover with repmgr – Part 1

January 24, 2020/39 Comments/in PostgreSQL, repmgr, Sadeq's PlanetPostgreSQL /by 2ndQuadrant Press

Replication configuration changes in PostgreSQL 12

October 7, 2019/0 Comments/in Ian's PlanetPostgreSQL, repmgr /by Ian Barwick

Historically, PostgreSQL’s replication configuration has been managed via a configuration parameters stored in a dedicated configuration file, recovery.conf, which has been present in PostgreSQL since the introduction of archive recovery in PostgreSQL 8.0. One of the major changes in PostgreSQL 12, co-authored by 2ndQuadrant is the replacement of recovery.conf and the conversion of recovery.conf parameters […]

Upgrading to PostgreSQL 11 with Logical Replication

September 6, 2018/8 Comments/in 2ndQuadrant, Eisentraut's PlanetPostgreSQL, PostgreSQL /by Peter Eisentraut

It’s time. About a year ago, we published PostgreSQL 10 with support for native logical replication. One of the uses of logical replication is to allow low- or no-downtime upgrading between PostgreSQL major versions. Until now, PostgreSQL 10 was the only PostgreSQL release with native logical replication, so there weren’t many opportunities for upgrading in […]

pglogical 2.1 and Logical Replication in PostgreSQL 10

December 13, 2017/11 Comments/in Petr's PlanetPostgreSQL /by Petr Jelinek

One of the headline features of the brand new PostgreSQL release out 2 months ago is Logical Replication. Logical replication allows more flexibility than physical replication, including replication between different major versions of PostgreSQL and selective-table replication. You can get more details on the feature here. So, now that we have this, I’ve been asked […]

PG Phriday: Getting RAD with Docker [Part 4]

December 8, 2017/5 Comments/in Shaun's PlanetPostgreSQL /by Shaun Thomas

PgBouncer is a popular proxy and pooling layer for Postgres. It’s extremely common to reconfigure PgBouncer with repmgr so it always directs connections to the current primary node. It just so happens our emerging Docker stack could use such a component. In our last article, we combined Postgres with repmgr to build a Docker container […]

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