This page documents a
mongoshmethod. This is not the documentation for database commands or language-specific drivers, such as Node.js.
For the database command, see the
sizefield returned by the
For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.
For the legacy
mongoshell documentation, refer to the documentation for the corresponding MongoDB Server release:
Returns: The size in bytes of the collection.
Data compressiondoes not affect this value.
Starting in MongoDB 4.4, to run on a replica set member,
collStatsoperations require the member to be in
SECONDARYstate. If the member is in another state, such as
STARTUP2, the operation errors.
In previous versions, the operations also run when the member is in
STARTUP2. The operations wait until the member transitioned to