Introducing Crunchy Data Warehouse: A next-generation Postgres-native data warehouse. Crunchy Data Warehouse Learn more
Elizabeth Christensen
Elizabeth Christensen
QGIS, the Quantum Geographic Information System, is an open-source graphical user interface for map making. QGIS works with a wide variety of file types and has robust support for integrating with Postgres and PostGIS. Today I just wanted to step through getting QGIS connected to a Postgres database and the basic operations that let you connect the two systems. Connecting QGIS to Postgres is very similar to any other GUI or application, you’ll need the database host, login, and password details....
Read MoreCraig Kerstiens
Craig Kerstiens
While database migrations are not an everyday thing for you, they are for us. Migrating to a new database provider isn't something you ever take lightly. Once you've come to the decision that you may want to migrate then you look at the time and effort cost of switching, only to wonder if it's really worth it. You decide it is, and still you're left with uncertainty of what-if: • What about Postgres versions? • What about Postgres extensions? • What about collations? • How do you minimize cutove...
Read MoreBrian Pace
Brian Pace
PostgreSQL uses the concept of a timeline to identify a series of WAL records in space and time. Each timeline is identified by a number, a decimal in some places, hexadecimal in others. Each time a database is recovered using point in time recovery and sometimes during standby/replica promotion, a new timeline is generated. A common mistake is to assume that a higher timeline number is synonymous with the most recent data. While the highest timeline points to the latest incarnation of the datab...
Read MorePaul Ramsey
Paul Ramsey
Clustering points is a common task for geospatial data analysis, and PostGIS provides several functions for clustering. • ST_ClusterDBSCAN • ST_ClusterKMeans • ST_ClusterIntersectingWin • ST_ClusterWithinWin ST_ClusterDBSCAN ST_ClusterKMeans ST_ClusterIntersectingWin ST_ClusterWithinWin We previously looked at the popular DBSCAN spatial clustering algorithm, that builds clusters off of spatial density. This post explores the features of the PostGIS ST_ClusterKMeans function. K-means cluste...
Read MoreGreg Sabino Mullane
Greg Sabino Mullane
My colleague Bob Pacheco asked me to help with a strange problem he was witnessing for a client. A new Postgres cluster was getting created on a Kubernetes node, but it refused to start. More mysteriously, there was no message in the Postgres logs, nothing in the pg_ctl start up file, and no output anywhere. The pg_ctl program started up, then ended. Nothing on stderr, nothing on stdout! We were able to duplicate it on the command line using pg_ctl. Oddly enough, a syntax error in the post...
Read MoreCraig Kerstiens
Craig Kerstiens
Today we're excited to release a big update to our Crunchy Bridge CLI: a new interactive menu for psql! Now when connecting to your Crunchy Bridge database with you'll have a option. The menu is an easy to navigate collection of insights about your database. All of these insights are powered by data already contained in Postgres system catalogs. We have these same database insights in the dashboard, so this feature extends that to those working directly from the command line. Before we add...
Read MoreElizabeth Christensen
Elizabeth Christensen
At PostGIS Day 2023 , one of our speakers showed off a really cool demo for getting JSON and SVGs in and out of Postgres / PostGIS and into Google Sheets. Brian Timoney put together several open source projects in such a cool way that I just had to try it myself. If you want to see his demo video, it is on YouTube . With Brian’s blessing, I’m writing up some additional details with a few of the sample code bits for those of you that want to try this or something similar for your own projects....
Read MoreJesse Soyland
Jesse Soyland
On the Customer Success Engineering team at Crunchy Bridge , we run across customers with lock issues on their Postgres database from time to time. Locks can have a cascading effect on queries. If one process is locking a table, then a query can be waiting on the process before it, and the process before that one. Major lock issues can quickly take down an entire production Postgres instance or application. In this post let’s look at why locks happen, and more importantly how to get to the bott...
Read MoreBob Pacheco
Bob Pacheco
In my role as a Solutions Architect at Crunchy Data, I help customers get up and running with Crunchy Postgres for Kubernetes (CPK). Installing and managing a Postgres cluster in Kubernetes has never been easier. However, sometimes things don't go as planned and I’ve noticed a few major areas where Kubernetes installations go awry. Today I want to walk through some of the most common issues I see when people try to get up and running with Postgres in Kubernetes and offer a list of basic troubl...
Read MoreGreg Sabino Mullane
Greg Sabino Mullane
You may have noticed a file called inside your data directory. This file gets created when Postgres first starts up, and gets removed on a clean shutdown. It seems to contain some random numbers and strings, but what do they all mean? The file will look like this: Here is a quick cheat sheet of the contents: The word "postmaster" is a relic from the early days of Postgres. This used to be the name of the main executable. While the main executable was, and still is, named "postgres", it also us...
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