db.collection.dataSize.txt

========================
db.collection.dataSize()
========================

.. default-domain:: mongodb

.. contents:: On this page
   :local:
   :backlinks: none
   :depth: 1
   :class: singlecol

.. method:: db.collection.dataSize()

   .. |dbcommand| replace:: :data:`~collStats.size` field returned by the
      :dbcommand:`collStats` command
   .. include:: /includes/fact-mongosh-shell-method-alt

   :returns: The size in bytes of the collection.
   
             :option:`Data compression <mongod
             --wiredTigerCollectionBlockCompressor>` does not affect
             this value.

   .. include:: /includes/extracts/4.4-changes-repl-state-restrictions-operation.rst

   .. |operations| replace:: :dbcommand:`collStats`

   

Compatibility
-------------

.. |command| replace:: method

This method is available in deployments hosted in the following environments:

.. include:: /includes/fact-environments-atlas-only.rst

.. include:: /includes/fact-environments-atlas-support-all.rst

.. include:: /includes/fact-environments-onprem-only.rst