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