MongoDB sharding algorithm, mongodbsharding

MongoDB sharding algorithm, mongodbsharding

There are two main types: range division by numerical values and hash, which are somewhat similar to the memcached cluster mechanism.

The following table compares the advantages and disadvantages

Sharding Algorithm	Range Query Performance	Data Distribution
Ranged based	Strong, easy to concentrate on multiple chunks on one shard	Uneven, affecting scale out
Hash based	Generally, you need to query multiple shard to obtain the result.	Uniform

MongoDB also provides a mechanism for customizing algorithms, called tag aware sharding.

The Administrator creates some tags with a range and develops these tags into various shards.

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