sys.dm_db_missing_index_group_stats returns no records

Hi all,

I've a huge machine with SQL Server 2005 Enterprise (10 TB of databases...).

I want to take a look at the missing indexes DMV offered by the db engine. Whan I query the sys.dm_db_missing_index_group_stats I get no records!

Both sys.dm_db_missing_index_groups and sys.dm_db_missing_index_details returns 600 records (Which I think is the maximum).

N.B.

sql server service is running without reboot from 3 months

there is no trace flag enabled

there is no -x parameter in the startup option