Try Redis -- Reddis Database online demo
http://try.redis-db.com/ very cool demo. Reddis command prompt in AJAX
Db
Yahoo!'s PNUTS Database: Too Hot, Too Cold or Just Right? | High Scalability
http://highscalability.com/yahoo-s-pnuts-database-too-hot-too-cold-or-just-right writeup on yahoo PTUNS (distributed database ). Also, see the original paper if you are interested.
Open Source Database Magazine
http://www.osdbzine.net/ pdf magazine that covers open-source databases, MySQL, PostgreSQL and alike.
[RUS] PostgreSQL vs MySQL
http://www.samag.ru/art/07.2007/07.2007_02.html test uses db schema and usage pattern from popular blog-hosting site. Benchmark uses optimized queries
What happened to Hot Standby?
http://it.toolbox.com/blogs/database-soup/what-happened-to-hot-standby-30391?rss=1 Josh Berkus explaing why hot-standby replication did not make it into postgresql 8.4