Charles2008
The getprop part of the db command indicates you are asking to be shown a value for a particular setting. As that value did not exist, then you were shown nothing, which caused you to be confused, & caused you to even think the command was wrong.
While it's OK to follow published commands "by rote", without necessarily having a proper understanding of those comnands, this does limit your experience, usability, & diagnostic ability.
I personally feel it would be far better for you to learn about & understand the db command syntax & switches etc, as doing so will allow you to have "instant" recognition of db settings & their effects etc.
The db command & the various sme server databases are a pretty easy concept to grasp.
To see the syntax usage, at the command prompt type
db
(followed by pressing the Enter key of course).
Refer to one of the many databases for what it all means eg accounts, configuration, yum_repositories & so on.
Also recommended reading is the
Db Command Tutorial Howto, a link to the Howtos is at top of Foums.
You will have a more enjoyable life using sme server if you understand & master the db command.