Database systems have been driving dynamic web sites since the early 90s, and caching and materialization have been the major techniques to improve the performance, scalability, and manageability of such web databases. Different from a traditional database environment, the software components of a web database, including web servers, database servers, application servers, and possibly additional middleware, are largely independent from one another, even though they work together as a holistic system. Caching and materialization techniques for such web databases consider a number of issues at...