The Database Dashboard displays information specific to an individual database.
Mouse over any graphs for details of the underlying counters.
Activity counters such as transactions & log flushes are the 'Per Second' values, therefore you may see values of less than 1 depending on you sample interval.
Mouse over any property labels to be given a link to the associated MSDN article for the property.
The properties can be hidden by clicking on the properties divider bar.