Hi, Nasr.
You can access the BMC home page, and choose System > System Configuration > System Parameter Settings from the navigation tree, and expand Log Configuration.
You can select the following items Enable so that the system saves the latest logs based on the preset time segment.

And you also can open the file directory:Installation directory/eSpace_UC/eSpace_UC_Server/Logs/BMU, the operation logs are stored in the BMU database. you can delete the log file.