Databases

http://pgexperts.com/document.html?id=49 Presentation by Josh Berkus (PostgeSQL developer) at MySQL User Conference 2011

http://pgexperts.com/document.html?id=49 Presentation by Josh Berkus (PostgeSQL developer) at MySQL User Conference 2011

http://www.mysqlperformanceblog.com/2011/02/03/how-innodb-handles-redo-logging/

http://www.mysqlperformanceblog.com/2011/02/03/how-innodb-handles-redo-logging/ How MySQL InnoDB implements transaction log, aka REDO (Oracle), aka WAL (PostgreSQL)

http://sqlserverpedia.com/wiki/Understanding_the_StackOverflow_Database_Schema Notes about schema used by StackOverflow.com and related websites. It is very simple, only several tables used. (most likely because there are performance problems with joins)

http://www.codeproject.com/cs/database/persisting_trees.asp