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sh.moveChunk(namespace, query, destination)

Moves the chunk that contains the document specified by the query to the destination shard. sh.moveChunk() provides a wrapper around the moveChunk database command.


In most circumstances, allow the balancer to automatically migrate chunks, and avoid calling sh.moveChunk() directly.


This command cannot be used for hashed shard keys, as it uses the find option from the moveChunk command. To move a chunk with a hashed shard key, use the moveChunk command specifying the bounds field.


mongosh Method

This page documents a mongosh method. This is not the documentation for database commands or language-specific drivers, such as Node.js.

For the database command, see the moveChunk command.

For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.

For the legacy mongo shell documentation, refer to the documentation for the corresponding MongoDB Server release:

mongo shell v4.4

sh.moveChunk() takes the following arguments:

The namespace of the sharded collection that contains the chunk to migrate.
An equality match on the shard key that selects the chunk to move.
The name of the shard to move.

By default, MongoDB cannot move a chunk if the number of documents in the chunk is greater than 2 times the result of dividing the configured chunk size by the average document size. The moveChunk command can specify the forceJumbo option to allow for the manual migration of chunks too large to move, with or without the jumbo label. See moveChunk command for details.


See also:

Given the people collection in the records database, the following operation finds the chunk that contains the documents with the zipcode field set to 53187 and then moves that chunk to the shard named shard0019:

sh.moveChunk("records.people", { zipcode: "53187" }, "shard0019")
← sh.isBalancerRunning()

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