Database Manual / Reference / Database Commands

Sharding Commands

Note

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

Name	Description
`abortMoveCollection`	Stops an in-progress `moveCollection` operation. New in version 8.0.
`abortReshardCollection`	Aborts a resharding operation. New in version 5.0.
`abortUnshardCollection`	Stops an in-progress `unshardCollection` operation. New in version 8.0.
`addShard`	Adds a shard to a sharded cluster.
`addShardToZone`	Associates a shard with a zone. Supports configuring zones in sharded clusters.
`analyzeShardKey`	Calculates metrics for evaluating a shard key. New in version 7.0.
`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.
`checkMetadataConsistency`	Performs a series of consistency checks on sharding metadata. New in version 7.0.
`clearJumboFlag`	Clears the `jumbo` flag for a chunk.
`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.
`configureCollectionBalancing`	Configures balancer settings on a sharded collection. New in version 5.3.
`configureQueryAnalyzer`	Configures query sampling for a collection. New in version 7.0.
`enableSharding`	Creates a 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.
`moveRange`	Migrates ranges between shards.
`mergeAllChunksOnShard`	Squashes mergeable chunks for a given collection on a shard.
`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.
`transitionFromDedicatedConfigServer`	Configures a dedicated config server to run as a config shard. New in version 8.0.
`transitionToDedicatedConfigServer`	Configures a config shard to run as a dedicated config server. New in version 8.0.
`unsetSharding`	Removed in MongoDB 5.0. Internal command that affects connections between instances in a MongoDB deployment.
`unshardCollection`	Unshards an existing sharded collection and moves the collection data onto a single shard. When you unshard a collection, the collection cannot be partitioned across multiple shards and the shard key is removed. New in version 8.0.
`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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