Find and Fix Fragmented Indexes

Introduction

Over time, SQL server indexes become fragmented as data are inserted and deleted from the tables they refer to. Identifying these and defragmenting them can improve your database performance.

Using the Code

Replace [databasename] with your database name and then run the following SQL:

select object_name(a.object_id), b.name , a.avg_fragmentation_in_percent,  
'ALTER INDEX ' + B.NAME + ' ON ' + OBJECT_NAME(a.object_id) + ' REORGANIZE ' AS FIX_SQL
from 
sys.dm_db_index_physical_stats(db_id(N'[databasename]'), DEFAULT, DEFAULT, DEFAULT, DEFAULT) as a
inner join
sysindexes as b
on a.object_id = b.id 
and a.index_id = b.indid
order by a.avg_fragmentation_in_percent desc

Then, from the results set if any indexes are highly fragmented, run the FIX_SQL to repair them.

Points of Interest

This runs a lot faster on the database itself than from master in my experience.

History

• 6^th February, 2014: Initial version