Ever wondered why size of Active Directory database is different on domain controllers? You might ask yourself if Active Directory supports MultiMaster technology, then all objects reside in database on all domain controllers, so if that is true, why the size of database (NTDS.DIT) is completely different on one domain controller to another?
This behaviour is completely by design and there should be nothing to worry about. However there are certain reasons behind this which you should be aware of. In order to fully understand these reasons I suggest you to watch the new video which I publiushed at my YouTube channel. I hope you find new video informative.