How to check fragmentation on SQL Server 2005

SELECT object_id, index_id, avg_fragmentation_in_percent, page_count 

FROM sys.dm_db_index_physical_stats(DB_ID('your_db_name'), OBJECT_ID('your_one_table'), NULL, NULL, NULL);

 

Reference Values (in %)	Action	SQL statement
avg_fragmentation_in_percent > 5 AND < 30	Reorganize Index	ALTER INDEX REORGANIZE
avg_fragmentation_in_percent > 30	Rebuild Index	ALTER INDEX REBUILD

 

 

http://blogs.msdn.com/b/jorgepc/archive/2007/12/09/how-to-check-fragmentation-on-sql-server-2005.aspx