"There's an interesting shift happening in the world of
Web-scale data stores. A whole new breed of scalable data stores is
gaining popularity very quickly. The traditional LAMP stack is
starting to look like a thing of the past. For a few years now,
memcached has often appeared right next to MySQL, and now the whole
"data tier" is being shaken up.
"While some might see it as a move away from MySQL and
PostgreSQL, the traditional open source relational data stores,
it's actually a higher-level change. Much of this is change is the
result of a few revelations:
1. a relational database isn't always the model or system for
every piece of data
2. relational databases are tricky to scale (especially if you
start with a single monolithic configuration–they aren't
distributed by design)
3. normalization often hurts performance
4. in many applications, primary key look-ups are all you need"
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