PostgreSQL Archives - Page 3 of 15 - 2ndQuadrant

Oracle to PostgreSQL: START WITH/CONNECT BY

June 8, 2020/3 Comments/in 2ndQuadrant, Kirk’s PlanetPostgreSQL, PostgreSQL /by Kirk Roybal

And now we arrive at the second article in our migration from Oracle to PostgreSQL series. This time we’ll be taking a look at the START WITH/CONNECT BY construct. In Oracle, START WITH/CONNECT BY is used to create a singly linked list structure starting at a given sentinel row. The linked list may take the form of a tree, and has no balancing […]

Oracle to PostgreSQL: ANSI outer join syntax in PostgreSQL

April 29, 2020/4 Comments/in 2ndQuadrant, Kirk’s PlanetPostgreSQL, PostgreSQL /by Kirk Roybal

We find ourselves at the third article in the Oracle migration series. This time, we look at those strange operators that modify the WHERE clause criteria in Oracle (+). Like everything else, PostgreSQL has a solution for that.

A tale of password authentication methods in PostgreSQL

April 27, 2020/0 Comments/in Eisentraut's PlanetPostgreSQL, PostgreSQL /by Peter Eisentraut

Let’s say you want to implement a password authentication method in a client/server protocol. How would you do that and what would be the possible problems? The following is the story of how this was done in PostgreSQL. password In the beginning, PostgreSQL only had the method that is now known as "password" in pg_hba.conf. […]

Developing PostgreSQL for Windows, Part 3

March 24, 2020/0 Comments/in Eisentraut's PlanetPostgreSQL, PostgreSQL /by Peter Eisentraut

Let’s wrap this up. In part 1 of this blog series, I explained the different Windows build targets supported by PostgreSQL. In part 2, I showed how to test patches for Windows compatibility and how to easily spin up a Windows environment for testing and simple development. Now, in this third and final part, we’ll […]

PostgreSQL is the worlds’ best database

March 23, 2020/4 Comments/in 2ndQuadrant, Kirk’s PlanetPostgreSQL, PostgreSQL /by Kirk Roybal

The title is not clickbait or hyperbole. I intend to prove that by virtue of both design and implementation that PostgreSQL is objectively and measurably a better database than anything currently available, with or without money considerations. How in the world can I claim and justify such a lofty statement? Read on, gentle nerd. I […]

How to Protect Your PostgreSQL Databases from Cyberattacks with SQL Firewall

March 11, 2020/2 Comments/in 2ndQuadrant, PostgreSQL, Sadeq's PlanetPostgreSQL /by 2ndQuadrant Press

In today’s world, organizations increasingly face an unprecedented level of threat of cyberattacks against their information assets. Cyberattacks can come in many forms. One such attack is called SQL injection. With SQL injection, rogue players target the backend database of any system. Usually, these systems are public-facing. Hackers try to send seemingly innocuous and regular […]

Developing PostgreSQL for Windows, Part 2

March 4, 2020/0 Comments/in Eisentraut's PlanetPostgreSQL, PostgreSQL /by Peter Eisentraut

In the previous blog post, we discussed the different Windows build variants that PostgreSQL supports. In this post, we’ll discuss how, as a Unix-based developer, you can check whether your patch might work on Windows. (For simplicity, I’ll say “Unix” to mean Linux, BSD, macOS, and similar.) First, there are a few ways to check […]

Researching PostGIS slowness (2019 edition)

February 27, 2020/2 Comments/in 2ndQuadrant, Alvaro's PlanetPostgreSQL, PostgreSQL /by Álvaro Herrera

Just as last year was ending, one of our long-time customers came to us because one of their long-existing PostgreSQL queries involving PostGIS geometry calculations was much slower for specific values. We researched the problem and found out how to solve it; read on! What we found as the cause of the problem will surprise […]

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 use the KNN Machine Learning Model with 2UDA – PostgreSQL and Orange (Part 1)

February 4, 2020/0 Comments/in 2ndQuadrant, PostgreSQL, Seemab's PlanetPostgreSQL /by Semab Tariq

This article gives a step by step guide to utilizing Machine Learning capabilities with 2UDA. In the article, we’ll use an example of Animals to predict whether they are mammals, Birds, Fish or Insects. Software versions We’re going to use 2UDA version 11.6-1 to implement the Machine Learning model. 2UDA version 11.6-1 combines: PostgreSQL 11.6 […]

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