snydeq writes "Non-relational upstarts — tools that tack the letters 'db' onto a 'pile of code that breaks with the traditional relational model' — have grabbed attention in large part because they willfully ignore many of the rules that codify the hard lessons learned by the old database masters. Doing away with JOINs and introducing phrases like 'eventual consistency,' these 'slacker DBs' offer greater simplicity and improved means of storing data for Web apps, yet remain toys in the eyes of old guard DB admins. 'This distinction between immediate and eventual consistency is deeply philosophical and depends on how important the data happens to be,' writes InfoWorld's Peter Wayner, who let down his old-guard leanings and tested slacker DBs — Amazon SimpleDB, Apache CouchDB, Google App Engine, and Persevere — to see how they are affecting the evolution of modern IT."
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