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Active Directory Cookbook by Robbie Allen

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16.14. Logging the Number of Expired Tombstone Objects

Problem

You want to log the number of expired tombstone objects that are removed from Active Directory during each garbage-collection cycle.

Solution

Using a graphical user interface

  1. Run regedit.exe from the command line or Start Run.

  2. Expand HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services NTDS Diagnostics.

  3. In the right pane, double-click on 6 Garbage Collection.

  4. For Value data, enter 3.

  5. Click OK.

Using a command-line interface

> reg add HKLM\System\CurrentControlSet\Services\NTDS\Diagnostics /v "6 Garbage[RETURN] 
Collection" /t REG_DWORD /d 3

Using VBScript

' 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"

Discussion

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 ...

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