Sharding Mechanics¶

The following documents describe sharded cluster processes.

Sharded Collection Balancing: Balancing distributes a sharded collection’s data cluster to all of the shards.
Chunk Migration Across Shards: MongoDB migrates chunks to shards as part of the balancing process.
Chunk Splits in a Sharded Cluster: When a chunk grows beyond the configured size, MongoDB splits the chunk in half.
Shard Key Indexes: Sharded collections must keep an index that starts with the shard key.
Sharded Cluster Metadata: The cluster maintains internal metadata that reflects the location of data within the cluster.

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