Sharded Cluster Behavior¶

These documents address the distribution of data and queries to a sharded cluster as well as specific security and availability considerations for sharded clusters.

Shard Keys: MongoDB uses the shard key to divide a collection’s data across the cluster’s shards.
Sharded Cluster High Availability: Sharded clusters provide ways to address some availability concerns.
Sharded Cluster Query Routing: The cluster’s routers, or mongos instances, send reads and writes to the relevant shard or shards.
Tag Aware Sharding: Tags associate specific ranges of shard key values with specific shards for use in managing deployment patterns.

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