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DG_BROKER_START enables Oracle to determine whether or not the Data Guard broker (DMON) process should be started. DMON is a non-fatal Oracle background process and exists as long as the instance exists, whenever this parameter is set to
If the site is never going to be configured in a Data Guard broker configuration, then you can leave the parameter unspecified and accept the default value of
false. If the site is part of a Data Guard broker configuration, then automatic startup of the DMON process is simplified by setting
true in the initialization parameter file.