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DOCS-9714 Clarify operation of compact command with WiredTiger #3143

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Dec 4, 2017
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DOCS-9714 Clarify operation of compact command with WiredTiger #3143

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13 changes: 9 additions & 4 deletions source/reference/command/compact.txt
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Expand Up @@ -153,10 +153,15 @@ To see how the storage space changes for the collection, run the
WiredTiger
``````````

On :ref:`WiredTiger <storage-wiredtiger>`, :dbcommand:`compact` will rewrite
the collection and indexes to minimize disk space by releasing unused disk space
to the system. This is useful if you have removed a large amount of data
from the collection, and do not plan to replace it.
On :ref:`WiredTiger <storage-wiredtiger>`, :dbcommand:`compact` attempts to
reduce the required storage space for data and indexes in a collection, releasing
unneeded disk space to the operating system. The effectiveness of this operation
is workload dependent and no disk space may be recovered. This command is useful
if you have removed a large amount of data from the collection, and do not plan
to replace it.

:dbcommand:`compact` does not require any additional disk space to run
on WiredTiger databases.

MMAPv1
``````
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