It can be difficult to determine which databases you are administering are actually being used. Below is a query that determines the last time an index was used since the last time SQL Server started to help narrow down these databases:
SELECT db.name, i.name, S.*, i.*
FROM sys.dm_db_Index_Usage_Stats S
inner join sys.databases db on db.database_id = s.database_id
inner JOIN sys.Indexes I
ON S.Index_Id = I.Index_Id
AND S.Object_Id = I.Object_Id
AND S.DataBase_Id = DB_ID()
where I.Object_Id > 1000
order by db.name
