Tuesday, June 3, 2014

Selecting a MongoDB Shard Key

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Scalability is an important non-functional requirement for systems using MongoDB as a back-end component. A system has to be able to scale when a single server running MongoDB cannot handle a large dataset size and/or high level of data processing. In general, there are two standard approaches addressing scalability:

  •  Vertical scaling 
  • Horizontal scaling 
Vertical scaling is achieved by adding more computing resources (CPU, memory, storage) to a single machine. This is considered to be an expensive option. At the same time computing resources on a single machine have physical limitations.

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