The Web 2.0 Development Survival Guide

Building software for Web 2.0 and the Social Media world is non-trivial. It requires understanding how to create infrastructure that will survive at Web scale, meaning that it may have to deal with tens of millions of individual items of data, and cope with hits from hundreds of thousands of users every minute. It also requires you to build tools that will be part of a much larger ecosystem of software and application families. In this lecture we will look at how traditional relational database systems have tried to cope with the scale of Web 2.0, and explore the NoSQL movement that seeks to simplify data-storage and create ultra-swift data systems at the expense of immediate consistency. We will also look at the range of APIs, libraries and interoperability standards that are trying to make sense of the Social Media world, and ask what trends we might be seeing emerge.

Examples in relational algebra

Some examples from the book. Connolly, T. M. and C. E. Begg (2005). Database systems : a practical approach to design, implementation, and management. Harlow, Essex, England ; New York, Addison-Wesley.

Database lectures Part 3

More on SQL

Database lectures Part 4

Normalisation, BCNF and third normal form.