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(DOCSP-18813): Note that change streams cannot leverage indexes #6033

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Oct 25, 2021
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(DOCSP-18813): Note that change streams cannot leverage indexes #6033

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16 changes: 16 additions & 0 deletions source/administration/change-streams-production-recommendations.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -83,3 +83,19 @@ From the moment an unsharded collection is sharded until the time the change
stream catches up to the first chunk migration, the ``documentKey`` in the
change stream notification document only includes the ``_id`` of the document,
not the full shard key.

Indexes and Performance
-----------------------

Change streams cannot use indexes. MongoDB does not support creating
indexes on the :term:`oplog` collection. Therefore, avoid opening a high
number of :ref:`specifically-targeted <changeStreams-watch-deployment>`
change streams as these can impact server performance.

Change Stream Optimization
~~~~~~~~~~~~~~~~~~~~~~~~~~

.. |change-streams| replace:: change streams

.. include:: /includes/change-streams-optimization.rst

6 changes: 4 additions & 2 deletions source/changeStreams.txt
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Expand Up @@ -53,8 +53,10 @@ Change streams are available for :doc:`replica sets <replication>` and

.. include:: /includes/extracts/changestream-rc-majority-4.2.rst

Watch Collection/Database/Deployment
------------------------------------
.. _changeStreams-watch-deployment:

Watch a Collection, Database, or Deployment
-------------------------------------------

You can open change streams against:

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