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merged 1 commit into from Oct 29, 2012
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Added comment about $all's inefficiency #355

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7 changes: 7 additions & 0 deletions source/reference/operator/all.txt
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Expand Up @@ -53,6 +53,13 @@ $all

In most cases, MongoDB does not treat arrays as sets. This
operator provides a notable exception to this approach.

Currently, $all queries scan all the documents that match
the first element in the query array. This means that even with
when the field is indexed, queries may take a very long time
to return (especially when the first element in the array appears
in many documents).
See: https://jira.mongodb.org/browse/SERVER-1000

.. seealso::
:method:`find() <db.collection.find()>`, :method:`update()
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