dbs/dba/ccms_maintenance is a SAP Parameter attribute which is used to control DBA Cockpit: CCMS Maintenance Enabling 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 .
This parameter enables or disables all maintenance functions for users
in the DBA Cockpit:
If the profile parameter is set to 0, SAP users cannot perform any
maintenance actions in the DBA Cockpit, regardless of their personal
authorizations.
If the profile parameter is set to 1, SAP users can perform maintenance
actions depending on their personal authorizations for the authorization
object S_RZL_ADM.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.