Databases

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What is RDF and what is it good for?

How RDF Databases Differ from Other NoSQL Solutions - The Datagraph Blog

This started out as an answer at Semantic Overflow on how RDF database systems differ from other currently available NoSQL solutions. I've here expanded the answer somewhat and added some general-audience context. RDF database systems are the only standardized NoSQL solutions available at the moment, being built on a simple, uniform data model and a powerful, declarative query language. These systems offer data portability and toolchain interoperability among the dozens of competing implementations that are available at present, avoiding any need to bet the farm on a particular product or vendor. In case you're not familiar with the term, NoSQL ("Not only SQL") is a loosely-defined umbrella moniker for describing the new generation of non-relational database systems that have sprung up in the last several years. These systems tend to be inherently distributed, schema-less, and horizontally scalable. How RDF Databases Differ from Other NoSQL Solutions - The Datagraph Blog
(Yes it's a long title, since people kept asking me to write about this and that too :) I do when it has a point.) While SQL databases are insanely useful tools, their monopoly in the last decades is coming to an end. And it's just time: I can't even count the things that were forced into relational databases, but never really fitted them.

Cassandra vs MongoDB vs CouchDB vs Redis vs Riak vs HBase comparison :: KKovacs

Cassandra vs MongoDB vs CouchDB vs Redis vs Riak vs HBase comparison :: KKovacs

elasticsearch - - Open Source, Distributed, RESTful, Search Engine

elasticsearch - - Open Source, Distributed, RESTful, Search Engine getting started is simple Installation is a snap. And we have documentation and support to help you along the way. Documentation Here are your key resources for getting started, example usage, and best practices. See Documentation Videos Insightful videos and talks from some of our best developers.
Introduction This is just a simple article visually explaining SQL JOINs. Background I'm a pretty visual person.

Visual Representation of SQL Joins

Visual Representation of SQL Joins