Sharding Commands

MongoDB 5.0 is end of life as of October 2024. This version of the documentation is no longer supported. To upgrade your 5.0 deployment, see the MongoDB 6.0 upgrade procedures.

Note

For details on a specific command, including syntax and examples, click on the link to the command's reference page.

Name	Description
`abortReshardCollection`	Aborts a resharding operation. New in version 5.0.
`addShard`	Adds a shard to a sharded cluster.
`addShardToZone`	Associates a shard with a zone. Supports configuring zones in sharded clusters.
`balancerCollectionStatus`	Returns information on whether the chunks of a sharded collection are balanced.
`balancerStart`	Starts a balancer thread.
`balancerStatus`	Returns information on the balancer status.
`balancerStop`	Stops the balancer thread.
`clearJumboFlag`	Clears the `jumbo` flag for a chunk.
`cleanupOrphaned`	Removes orphaned data with shard key values outside of the ranges of the chunks owned by a shard.
`cleanupReshardCollection`	Cleans up a failed resharding operation. New in version 5.0.
`commitReshardCollection`	Forces a resharding operation to block writes and complete. New in version 5.0.
`enableSharding`	Enables sharding on a specific database.
`flushRouterConfig`	Forces a `mongod` / `mongos` instance to update its cached routing metadata.
`getShardMap`	Returns the hostnames and connection strings for shards in the cluster and the config servers for your cluster.
`isdbgrid`	Verifies that a process is a `mongos`.
`listShards`	Returns a list of configured shards.
`moveChunk`	Internal command that migrates chunks between shards.
`movePrimary`	Reassigns the primary shard when removing a shard from a sharded cluster.
`mergeChunks`	Provides the ability to combine chunks on a single shard.
`refineCollectionShardKey`	Refines a collection's shard key by adding a suffix to the existing key.
`removeShard`	Starts the process of removing a shard from a sharded cluster.
`removeShardFromZone`	Removes the association between a shard and a zone. Supports configuring zones in sharded clusters.
`reshardCollection`	Initiates a resharding operation to change the shard key for a collection, changing the distribution of your data. New in version 5.0.
`setAllowMigrations`	Prevents the start of new automatic migrations on a collection, prevents in-flight manual migrations from committing, and excludes the collection from new balancer rounds.
`shardCollection`	Enables the sharding functionality for a collection, allowing the collection to be sharded.
`shardingState`	Reports whether the `mongod` is a member of a sharded cluster.
`split`	Creates a new chunk.
`unsetSharding`	Removed in MongoDB 5.0. Internal command that affects connections between instances in a MongoDB deployment.
`updateZoneKeyRange`	Adds or removes the association between a range of sharded data and a zone. Supports configuring zones in sharded clusters.

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replSetSyncFrom

abortReshardCollection