Microsoft Windows Server 2003 (Apache web server) Inside Out The remaining
Microsoft Windows Server 2003 Inside Out The remaining hive files are stored in individual user profile directories with the default name of Ntuser.dat. These files are in fact hive files that are loaded into the Registry and used to set the pointer for the HKEY_CURRENT_USER root key. When no user is logged on to a system, the user profile for the default user is loaded into the Registry. When an actual user logs on, this user s profile is loaded into the Registry. Chapter 14 Note The root keys not mentioned are HKEY_CURRENT_CONFIG and HKEY_CLASSES_ ROOT. The on-disk data for HKEY_CURRENT_CONFIG comes from the subkey from which it is built: HKEY_LOCAL_MACHINE SYSTEMCurrentControlSetHardware ProfilesCurrent. Similarly, the on-disk data for HKEY_CLASSES_ROOT comes from HKEY_LOCAL_MACHINE SOFTWAREClasses and HKEY_CURRENT_USERSOFTWAREClasses. Every hive file has an associated .log file even Ntuser.dat, whose log file is Ntuser.dat.log. Windows Server 2003 uses the log files to help protect the Registry during updates. When a hive file is to be changed, the change is first written to the associated log file. It is then written to disk. The system then uses the change log to write the changes to the actual hive file. If the system were to crash while a change is being written to a hive file, the change log could later be used by the system to roll back the change, resetting the hive to its previous configuration. Inside Out How Windows Server 2003 starts over with a clean Registry Examine %SystemRoot%System32Config closely and you ll see several files with the .sav extension. These files represent the postinstallation state of the Registry. If you ever wonder how Windows Server 2003 can reset the Registry to that of a clean install after you demote a domain controller, this is the answer. By loading these files into the Registry and then writing them to disk as the original hive files, the server is returned to its postinstallation state with a clean Registry. Types of Registry Data Available When you work your way down to the lowest level of the Registry, you see the actual value entries. Each value entry has a name, a data type, and a value associated with it. Although value entries have a theoretical size limit of 1024 KB, most value entries are less than 1 KB in size. In fact, many value entries contain only a few bits of data. The type of information stored in these bits depends on the data type of the value entry. 424 Part 4: Managing Windows Server 2003 Systems
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