You want to log the number of expired tombstone objects that are removed from Active Directory during each garbage-collection cycle.
Run regedit.exe from the command line or Start Run.
Expand HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services NTDS Diagnostics.
In the right pane, double-click on 6 Garbage Collection.
For Value data, enter 3.
> reg add HKLM\System\CurrentControlSet\Services\NTDS\Diagnostics /v "6 Garbage[RETURN] Collection" /t REG_DWORD /d 3
' This code enables garbage collection logging. ' ------ SCRIPT CONFIGURATION ------ strDCName = "<DomainControllerName>" intValue = 3 ' ------ END CONFIGURATION --------- const HKLM = &H80000002 strNTDSReg = "SYSTEM\CurrentControlSet\Services\NTDS\Diagnostics" set objReg = GetObject("winmgmts:\\" & strDCName & "\root\default:StdRegProv") objReg.SetDWORDValue HKLM, strNTDSReg, "6 Garbage Collection," intValue WScript.Echo "Garbage Collection logging enabled"
Here is a sample event that is logged when the 6 Garbage Collection diagnostics logging level is set to 3 or higher:
Event Type: Information Event Source: NTDS General Event Category: Garbage Collection Event ID: 1006 Date: 6/24/2003 Time: 11:29:31 AM User: NT AUTHORITY\ANONYMOUS LOGON Computer: DC1 Description: Internal event: Finished removing deleted objects that have expired (garbage collection). Number of expired deleted objects that have been removed: 229.
Recipe 15.2 for more on diagnostics logging and Recipe 16.13 for more on the garbage-collection process