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Windows defrag on SQL Server 2005 machine?

reddal asked
Medium Priority
Last Modified: 2012-05-06

Is it necessary / recommended to run Windows defrag on servers primarily used for SQL Server 2005?

I have a server (Windows 2003 x64) with quite a lot of data on it split over several volumes - which have never been defragmented. Most of the data is SQL Server 2005 databases - but some is files/documents.

Should I run a windows defrag on the volumes? If so is it necessary to do this with the databases offline?

thanks - reddal
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Databases do become not contiguous over time, and for that reason I run contig.exe which does a single file defrag and will run online but seems to slow things up a bit so it runs during off peak hours weekly via .bat files and Task Scheduler.  

Contig.exe can be downloaded from Microsoft for free at sysinternals:




Instead of contig i would just defrag the whole drive but I wouldnt do it frequently unless the database frequently grows and shrinks creating a lot of fragmentation. I would also recommend Running a defrag in SQL Server because daabases have their own kind of defragmentation.

Actually there are two kinds of fragmentation in SQL server files. And Defrag won't necessarily make a file contiguous.
An initial single file defrag using contig.exe, followed by a rebuild of all clustered indexes should get you database in a fairly optimum condition storage wise, but this wouldn't be a complete defrag of the data within the database file though.. Having the database offline would be advisable..

You can get a list of all clustered indexes with the following command -

SELECT Name FROM sysindexes where indid = 1

Use this list in a cursor and use the DBCC DBREINDEX command to rebuild the clustered indexes.

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