I am pretty new to ArcGIS for Server and ArcSDE but cannot find a solution in the Esri Documentation or Forums.
I don not know how to use sdemon or even where to start this command line tool.
Robert, if you are on 10.1, you need to install the ArcSDE Command Line Tools separately by running the application server install program. The installation would be DBMS specific. Here is the reference for the sdemon command in SQL Server, for instance. Otherwise, the full CMD commands reference is installed with this installation on your local machine, so you can always access it from the Start menu (assuming you are on Windows). The 10.0 version (no big difference with 10.1) is available here.