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Asked: 2026-06-07T05:06:10+00:00

I’m new in NoSQL databases and now I use MongoDB, BTW I have a

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I’m new in NoSQL databases and now I use MongoDB, BTW I have a question about MongoDB shard key and I want to know what it does actually? Is it related to queries performance? And how we can choose a good shard key for a collection?

Thanks in advance

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  1. Editorial Team

    From 10gen’s docs: http://www.mongodb.org/display/DOCS/Choosing+a+Shard+Key

    Choosing a shard-key is very dependent on your data and your use case.

    Here’s some more documentation you may find relevant:

    http://docs.mongodb.org/manual/faq/sharding/

    http://docs.mongodb.org/manual/sharding/

    Specifically:

    http://docs.mongodb.org/manual/core/sharding/

    Essentially sharding allows you to partition your data across different servers. This means different writes/reads are going to different servers — distributing the load of the application across multiple servers.

    The shard key is the value in the collection that you are evaluating to determine which shard/server the document is being routed too.

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