If you have a lots of dozen of database in your Active Directory so you can compact (defrag) your database
for better AD performance:-
> Open services.msc
> Stop active directory domain services
> open command prompt run as administrator
> ntdsutil
> ntdsutil: activate instance ntds
> ntdsutil: files
> file maintance: compact to c:\temp (type the address where your compact database held)
> file maintenance: quit
> ntdsutil: quit
Now copy that compact database to your original database
> copy c:\temp\ntds.dit c:\windows\ntds\ntds.dit
And now deleted the log files which are represented the previous database
> del c:\windows\ntds\*.log
> And start active directory domain services
Enjoy the Ride
Rahul$
