DB02 - Doesn´t show anything

Hello,

I´m facing a weird issue in SAP ERP 6.0 EHP5 with SQL Server 2005 on Windows Server.

I´m not able to see any values in tcode DB02 (for example Space - Database Size History)! Can you tell me please why? How can I see all the values/statistics of my SQL Server database?

I guess this is related with a standard job, am I right? Which one?

Thank you,

samid raif