SQL Data Size Monitoring

SQL Data Size Monitoring

Hi,
 We are currently beginning to use Applications Manager to monitor our SQL Server Performance, and we have noticed that there is one field that we would like to be able to see/alert on.
We have some databases that are required to be created as fixed size with no auto-growth enabled.
Is it possible to view the Data Size Used in MB vs the Size in MB, so that this can be monitored? 

Regards, Josh
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