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DOCS-9267 WT space requirements for repairDatabase #3147

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Dec 22, 2017
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DOCS-9267 WT space requirements for repairDatabase #3147

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31 changes: 20 additions & 11 deletions source/reference/command/repairDatabase.txt
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Expand Up @@ -96,22 +96,31 @@ Behavior

.. include:: /includes/warning-blocking-global.rst

.. note:: :dbcommand:`repairDatabase` requires free disk space equal to the size
of your current data set plus 2 gigabytes. If the volume that holds dbpath
lacks sufficient space, you can mount a separate volume
and use that for the repair. When mounting a separate volume for
:dbcommand:`repairDatabase` you must run :dbcommand:`repairDatabase`
from the command line and use the
:option:`--repairpath <mongod --repairpath>`
switch to specify the folder in which to store
temporary repair files.


The time requirement for :dbcommand:`repairDatabase` depends on the
size of the data set.

:dbcommand:`repairDatabase` recreates all indexes in the database.

MMAPv1
~~~~~~

:dbcommand:`repairDatabase` requires free disk space equal to the size of your
current data set plus 2 gigabytes.
If the volume that holds dbpath lacks sufficient space, you can mount a separate volume
and use that for the repair. When mounting a separate volume for
:dbcommand:`repairDatabase` you must run :dbcommand:`repairDatabase`
from the command line and use the
:option:`--repairpath <mongod --repairpath>`
switch to specify the folder in which to store
temporary repair files.

WiredTiger
~~~~~~~~~~

:dbcommand:`repairDatabase` performs the operation in-place and does not require
additional disk space.


``repairDatabase`` and ``compact``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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