Retrieve Indexes Not Used Since the Last Recycle Time
Description
Sample script that lists any index not used since the last time SQL Server was recycled. Unused indexes will not appear in sys.dm_db_index_usage_stats. This script, contributed by Microsoft's Tom Davidson, requires SQL Server 2005.
Script Code
use Northwind
go
select object_name(i.object_id), i.name
from sys.indexes i, sys.objects o
where i.index_id NOT IN (select s.index_id
from sys.dm_db_index_usage_stats s
where s.object_id=i.object_id and
i.index_id=s.index_id and
database_id = db_id('Northwind') )
and o.type = 'U'
and o.object_id = i.object_id
order by object_name(i.object_id) asc
go
---- note: Period index x2 is on OrderDate
select * from Period
where OrderDate = getdate()
--- note: Perid index x1 is on DateID
select * from Period
where DateID = 20001010
go
---- after executing the above select statement from the Period table, redisplay the indexes NOT used
---- you will discover the x1 and x2 indexes are no longer listed as NOT used.
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Disclaimer
The sample scripts are not supported under any Microsoft standard support program or service. The sample scripts are provided AS IS without warranty of any kind. Microsoft further disclaims all implied warranties including, without limitation, any implied warranties of merchantability or of fitness for a particular purpose. The entire risk arising out of the use or performance of the sample scripts and documentation remains with you. In no event shall Microsoft, its authors, or anyone else involved in the creation, production, or delivery of the scripts be liable for any damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information, or other pecuniary loss) arising out of the use of or inability to use the sample scripts or documentation, even if Microsoft has been advised of the possibility of such damages.
