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Update journaling.txt #1566

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7 changes: 5 additions & 2 deletions source/core/journaling.txt
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Expand Up @@ -41,8 +41,11 @@ different filesystem.
.. important::

If you place the journal on a different filesystem from your data
files you *cannot* use a filesystem snapshot to capture valid
backups of a :setting:`dbpath` directory.
files you *cannot* use a filesystem snapshot alone to capture valid
backups of a :setting:`dbpath` directory. In this case, use
:method:`~db.fsyncLock()` to ensure that database files are consistent
before the snapshot and :method:`~db.fsyncUnlock()` once the snapshot
is complete.

.. note::

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