DB Fiddle: A Web-Based SQL Database Playground — Think of JS Fiddle but for playing with SQL in the browser. It offers MySQL 5.5-5.7 and Postgres 9.5-9.6 backends.

Writing a Time Series Database from Scratch — Prometheus is an open source monitoring tool that includes a custom time series database. This is a deep dive into fleshing out a new architecture to address the existing database engine’s shortcomings.

New Features Coming to PostgreSQL 10 — Brief summaries on the key features coming to Postgres soon, including declarative partitioning and durable hash indexes. It’s going to be a huge release.

Webinar: Better Azure SQL Performance — Learn how to reduce development times by getting a better understanding of how your Azure SQL workloads are really performing. Register now.

Databazel: Open Source Analytics and Reports for MongoDB — Directly connects to MongoDB (no ETL necessary) and presents results in a visual dashboard reporting interface.

QuickDBD: Draw Database Diagrams Simply By Typing — You write out a schema in a simplified text format (almost like SQL’s answer to Markdown) and it produces good looking diagrams. No signup needed.

How Reddit Built A High Traffic Pixel Art Gallery — Reddit built an interactive pixel art system (called /r/place) that had to work with 100,000s of users from day one. This fascinating post goes into the details including why Cassandra was rejected as a data store, and how Redis was used.

Elasticsearch Cluster Lifecycle at eBay — A look at some of what’s involved with streamlining the rollout and management of Elasticsearch clusters.