Moving Yelp's Core Search to Elasticsearch — A post mortem of Yelp’s successful migration to Elasticsearch from a custom system built on top of Lucene.

An Architectural Comparison of NoSQL Databases [PDF] — A white paper that compares and contrasts GridDB, Cassandra, MongoDB, Riak, and Couchbase.

Apache RocketMQ: A Distributed Messaging and Streaming Data Platform — Targeting Java, .NET and C++ users and aims to work around scaling issues in Kafka and ActiveMQ. There’s a comparison table available.

Get started with MongoDB — We've put together a hub of our most popular resources to help jump-start your understanding of MongoDB. Check it out.

Introducing Dexter: An Automatic Indexer for Postgres — By monitoring queries this tool will generate queries to improve their performance.

Exactly-Once Semantics Is Possible: Here's How Apache Kafka Does It — Kafka 0.11 has implemented ‘exactly-once semantics’, a significant feature. But how?

Making The Internet Archive’s Full Text Search Faster — How the Internet Archive made their full-text organic search faster — without scaling horizontally — allowing users to search across 35 million documents in seconds.

Using Emoji in SQL — This doesn’t sound like a great idea but it does work, at least with SQLite and PostgreSQL 9.6.

Whitepaper: 5 Steps to Agile Database Management — Database Management is years behind software development. Here's how to bring your DBs up to speed.

Building SQL Queries for Funnel Analysis — How Statsbot constructs SQL queries for conversion funnel analysis.

Postgres 10 Beta vs Postgres 9.6 Analytics Performance — How does the latest version of Postgres, still in beta, fare performance-wise?

Autoscaling for your Heroku dynos — Automatically scale up and down to handle increased workloads and avoid wasting money on idle resources.