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Recently I was asked what I thought was the most important trend in IT. And it wasn't hard to answer: The shift from proprietary, scale-up systems to commodity, open source, scale-out systems.

NoSQL databases provide a good example of scaling out versus up. To beef up Oracle or any other conventional, proprietary RDBMS, you need to scale up the database server with more cores, more caching, more flash, and so on. At a certain point, you'll need another server, which means you'll be saddled with sharding the database and maintaining it in that state (yes, you could use Oracle RAC, but that's another story).

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