Well, it isn't populated. SMP stopped populating that table sometime in June last year. Since then I repaired the Inventory Solution as suggested by Symantec and I have installed a couple of new clients, so I deployed the Agent freshly all the time. And a Symantec Support Engineer and I checked, if the Policies are enabled, distributed and if they gather data.
As written, last week we updated the whole SMP to the latest Version (Symantec Managment Agent is Version 7.0.8641.1641, AM Agent is 7.0.1295). We disabled all AM Polices except for two very simple ones, that only check for one criteria and we can see the Start-Stop-Events being shown on the server. So yes, AM must be working to a certain degree.
No warnings that we can see. Whereas "we" is the Support Engineer of OnTrex (a local Symantec Platinum Partner) The AM Configuration is set, so "Clients send summary data every:" is set to 1 day at the moment. On friday when we worked on it, we even set it to 5 minutes for some hours.
I'll install diagnostics on the client today... if I find out how to do it ;-)
But the main question I have remains... what does populate the Inv_Monthly_Summary? How is it populated? Stored procedure? Server-Task?