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DOCS-4703: document database size limit #2163

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DOCS-4703: document database size limit #2163

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7 changes: 7 additions & 0 deletions source/reference/limits.txt
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Expand Up @@ -132,6 +132,13 @@ Data
creating a capped collection, there is no limit on the number of
documents.

.. _limit-database-size:
.. limit:: Database Size

The MMAPv1 storage engine limits each database to no more than 16000 data
files. This means that a single MMAPv1 database has a maximum size of 32TB.
Setting the :setting:`storage.mmapv1.smallFiles` option reduces this limit to 8TB.

.. _limit-data-size:
.. limit:: Data Size

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