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Seven Databases in Seven Weeks by Jim R. Wilson, Eric Redmond

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Day 3: Replica Sets, Sharding, GeoSpatial, and GridFS

Mongo has a powerful ability to store and query data in a variety of ways. But then again, so can other databases. What makes document databases unique is their ability to efficiently handle arbitrarily nested, schemaless data documents. What makes Mongo special in the realm of document stores is its ability to scale across several servers, by replicating (copying data to other servers) or sharding collections (splitting a collection into pieces) and performing queries in parallel. Both promote availability.

images/mongo-crud.png

Replica Sets

Mongo was built to scale out, not to run stand-alone. It was built for ...

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