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Posting Yak Master

United Kingdom
180 Posts

Posted - 12/05/2013 :  07:30:16  Show Profile  Reply with Quote
Is it safe to run a disk defragmentation task on a disk that has SQL Server installed on it?

Will it impact performance of the databases?
Could it cause any data corruption?



United Kingdom
22859 Posts

Posted - 12/05/2013 :  07:33:52  Show Profile  Reply with Quote
I only defragment the disk when the SQL Service is stopped (i.e. schedule downtime). I specifically defragment Data and Index files individually (using CONTIG from Sysinternals) to try to get them onto contiguous disk space.

Every little helps

(EDIT: For avoidance of doubt we don't schedule downtime in order to defrag files, but we do defrag files when we have downtime for other activities, such as upgrading hardware)

Edited by - Kristen on 12/06/2013 03:13:43
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Almighty SQL Goddess

38200 Posts

Posted - 12/05/2013 :  15:47:47  Show Profile  Visit tkizer's Homepage  Reply with Quote
We don't ever defragment the disks. Our systems are 24x7x365.

Tara Kizer
SQL Server MVP since 2007
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