Event ID - 1966

Event Id1966
SourceNTDS SDPROP
Description The security descriptor propagator has completed a full propagation pass. Allocated space (MB): XX Free space (MB): XX This may have increased free space in the Active Directory database. User Action: Consider defragmenting the database offline to reclaim the free space that may be available in the Active Directory database. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Event InformationThis event message indicates that the single instance store operation has completed and serves as a queues the administrator to perform of offline defragmentation of the Ntds.dit using NTDSUTIL.EXE. 

The offline defragmentation can reduce the size of a Windows 2000 Ntds.dit file by up to 40%, improves Active Directory performance, and updates the pages in the database for more efficient storage of Link Valued attributes.
Reference Links How to upgrade Windows 2000 domain controllers to Windows Server 2003

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