sh.moveChunk()
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Definition
sh.moveChunk(namespace, query, destination)
Moves the chunk that contains the document specified by the
query
to thedestination
shard.sh.moveChunk()
provides a wrapper around themoveChunk
database command.Important
In most circumstances, allow the balancer to automatically migrate chunks, and avoid calling
sh.moveChunk()
directly.Important
mongo Shell Method
This page documents a
mongo
method. This is not the documentation for database commands or language-specific drivers, such as Node.js. To use the database command, see themoveChunk
command.For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.
sh.moveChunk()
takes the following arguments:ParameterTypeDescriptionnamespace
stringThe namespace of the sharded collection that contains the chunk to migrate.query
documentAn equality match on the shard key that selects the chunk to move.destination
stringThe name of the shard to move.By default, MongoDB cannot move a chunk if the number of documents in the chunk is greater than 1.3 times the result of dividing the configured chunk size by the average document size. Starting in MongoDB 4.4, the
moveChunk
command can specify a new option forceJumbo to allow for the manual migration of chunks too large to move, with or without the jumbo label. See moveChunk command for details.
Example
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")