Here is a link to allow an administrator to disconnect users or all users who are currently connected to an Enterprise geodatabase:
http://resources.arcgis.com/en/help/main/10.2/index.html#//018v00000061000000
It may be helpful to keep the users out while you complete a task:
http://resources.arcgis.com/en/help/main/10.2/index.html#//018v0000008r000000
