Modelization. Modelization. An Introduction To Cassandra: The Data Model. I'm fairly new to the whole NoSQL game, and one thing I keep hearing is how great Cassandra is. Built by Facebook and open sourced in 2008, Cassandra is probably the most popular NoSQL implementation: "A massively scalable, decentralized, structured data store". Cassandra takes it's distribution features from Dynamo and the data model from BigTable.
Before we look at using Cassandra, we first need to understand the data model. For developers new to Cassandra, coming from a relational database background, the data model can be a bit confusing. Here's a summary of how the Cassandra data model is composed: Column A Column is the most basic element in Cassandra: a simple tuple that contains a name, value and timestamp. SuperColumnA SuperColumn is a column that stores an associative array of columns. ColumnFamily A ColumnFamily hold a number of Rows, a sorted map that matches column names to column values. The ColumnFamily can be of two types, Standard or Super. Langage. Project tecniques. QA. Books. Courses. Free Computer Books > J2ee. Design Patterns. Capuccino. 20 Useful Free PDF ebooks for Designers and Bloggers.
Over the years I have a saved a decent sized library of useful design and blogging related PDF ebooks, I love them. I have voraciously collected them, and all stored on my mobile for whenever the chance of quick read arises. In this post I would like to share my favorite 20 (freely available) ebooks with you. All of the below books are have been written to be read quickly, they are neither very long nor are they the definitive resource on their specific subject. Having said that, they are all a ‘darn good read’, and well worth downloading. Some of the books may have been written a few years back, but the topics are certainly relevant now. Introduction to Good Usability by Peter Pixel This guide is especially handy if you haven’t done a lot of webdesign yet or if you are involved in webdesign but don’t do any of the real work.
A lot of books have been written in the past but the threshold for reading them, especially if you have never built a site, is quite big, hence this short guide. Gestion de projet. Good Fucking Design Advice. Products.
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