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Sharding Methods

Note

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

Name
Description
db.checkMetadataConsistency()

Checks the cluster or database for inconsistent sharding metadata.

New in version 7.0.

Checks the collection for inconsistent sharding metadata.

New in version 7.0.

Aborts a resharding operation.

New in version 5.0.

Adds a shard to a sharded cluster.
This method aliases to sh.addShardToZone().
Associates a shard to a zone. Supports configuring zones in sharded clusters.
This method aliases to sh.updateZoneKeyRange().

Returns information on whether the chunks of a sharded collection are balanced.

New in version 4.4.

Checks the cluster for inconsistent sharding metadata.

New in version 7.0.

Forces a resharding operation to block writes and complete.

New in version 5.0.

Disables automatic chunk merges for a namespace.

New in version 7.0.

Disable balancing on a single collection in a sharded database. Does not affect balancing of other collections in a sharded cluster.

Enables automatic chunk merges for a namespace.

New in version 7.0.

Activates the sharded collection balancer process if previously disabled using sh.disableBalancing().

Disables auto-splitting for the sharded cluster.

Starting in MongoDB 6.1, automatic chunk splitting is not performed. This is because of balancing policy improvements. Auto-splitting commands still exist, but do not perform an operation. For details, see Balancing Policy Changes.

Enables auto-splitting for the sharded cluster.

Starting in MongoDB 6.1, automatic chunk splitting is not performed. This is because of balancing policy improvements. Auto-splitting commands still exist, but do not perform an operation. For details, see Balancing Policy Changes.

Creates a database.
Returns a boolean to report if the balancer is currently enabled.

Returns data distribution information for sharded collections. sh.getShardedDataDistribution() is a shell helper method for the $shardedDataDistribution aggregation pipeline stage.

This method aliases to sh.removeRangeFromZone().
Removes an association between a range of shard keys and a zone. Supports configuring zones in sharded clusters.
Returns help text for the sh methods.
Returns a document describing the status of the balancer.
Migrates a chunk in a sharded cluster.
This method aliases to sh.removeShardFromZone().
Removes the association between a shard and a zone. Use to manage zone sharding.

Initiates a resharding operation to change the shard key for a collection, changing the distribution of your data.

New in version 5.0.

Enables or disables the balancer which migrates chunks between shards.
Enables sharding for a collection.
Divides an existing chunk into two chunks using a specific value of the shard key as the dividing point.
Divides an existing chunk that contains a document matching a query into two approximately equal chunks.

Enables the AutoMerger.

New in version 7.0.

Enables the balancer and waits for balancing to start.
Reports on the status of a sharded cluster, as db.printShardingStatus().

Disables the AutoMerger.

New in version 7.0.

Disables the balancer and waits for any in progress balancing rounds to complete.
Internal. Waits for the balancer state to change.
Internal. Waits until the balancer stops running.
Internal. Waits for a change in ping state from one of the mongos in the sharded cluster.
Associates a range of shard keys to a zone. Supports configuring zones in sharded clusters.
Returns the hashed value for the input.

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