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Day: May 15, 2026

What’s New in Cassandra 6

Published 2026-05-15 by Kevin Feasel

Mariah McLaughlin lays out some of the new features in the latest version of Cassandra:

Accord is a general-purpose transaction framework that uses a leaderless consensus protocol to have highly available transactions and is used in Cassandra 6. The goal is broader transactional support across multiple keys, with strict serializable isolation and without a central bottleneck.

This matters because multi-key consistency is hard to handle cleanly in application code. Once a workflow spans more than one partition, the application often ends up doing coordination work that really belongs in the database.

Accord enables ACID behavior on transactional tables, which lets developers coordinate multi-step, multi-partition changes with stronger correctness guarantees, reducing the amount of custom consistency logic they have to build in the application.

Click through for more information on this, as well as a few other significant features.

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Scoring the Quality of Binary Classification with SQL Server

Published 2026-05-15 by Kevin Feasel

Sebastiao Pereira quantifies a result:

Machine Learning (ML) is a way of teaching computers to learn from data instead of being explicitly programmed. Performance metrics are essential tools for understanding how well a model actually works. They tell you not just how accurate the model is, but how reliable, fair, and useful it will be in real-world applications. In other words, without them, machine learning would be a trial-and-error guesswork.

Binary classification is when each sample is labeled as one of two mutually exclusive classes, referenced to a categorization, like positive or negative.

How do you implement the binary classification performance metric in SQL Server without using external tools?

Click through for a series of metrics to determine how well a binary classification process performed. This post doesn’t include details on how to perform the classification, just what to do once you have the results.

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Eleven CVEs for PostgreSQL

Published 2026-05-15 by Kevin Feasel

Christophe Pettus takes us through just shy of a dozen security issue fixes:

PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are out as of May 14, 2026. The release fixes eleven security issues and more than sixty bugs. That is not a typo. Eleven CVEs is the largest single-release security batch I can remember, and three of them are CVSS 8.8 with practical exploitation paths. Patch this week. If you can patch tomorrow, patch tomorrow.

Click through for a rundown.

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Partitioning and Columnstore Indexes

Published 2026-05-15 by Kevin Feasel

Erik Darling puts together a great combination for a very large dataset:

 So, today we’re going to talk about partitioning in columnstore because there are important differences between partitioned columnstore tables and partitioned rowstore tables. One of the sort of superpowers that columnstore has is the ability to use metadata about which row groups have which data in them, and it can skip entire segments that do not contain relevant data.

I agree with Erik’s point that you do need around 500 million or so rows before this capability really shines, but if you do pick the right partition key, you get one of those rare and coveted performance improvements from partitioning.

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