as4/dbmon/enable is a SAP Parameter attribute which is used to control dbmon functionality enabled ? information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
as4/dbmon/enabled = 0 ->
no use of new dbmon functionality
= 1 ->
dbmon will be automatically started for all work processes
See SAP Parameter Documentation for full SAP documentation for this profile parameter.