Hello,
as I understand it, the Cisco IOS DHCP server records DHCP address conflicts in a log file, and that log file is stored on a database agent, and the database agent is the only way to record address conflicts. If there is no database agent configured, there is no way to record address conflicts, hence it is recommended to turn off conflict logging.
So that means the router that is configured as a DHCP server cannot store an address conflict log file without that database agent.
HTH,
GP