Re: uCMDB replication using GDBA as a source adapter
GDBA was not designed for replication at all, so it won't help you. You have to look at developing your own custom discovery pattern that will connect to DB, submit appropriate SQL queries to grab data needed and insert the data into uCMDB.
If you need an example you can try to get a DDMi(aka ED)/uCMDB integration package. Product versions are not that important - the integration approach remains the same: DDMi data replication to uCMDB based on MySQL DB discovery.