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Figure 9-7: The Group Policy snap-in There are two major configuration groups in the domain group policy: Computer Configuration and User Configuration These correspond to the System Policy Editor and User Policies, respectively Each group contains three major containers for policies: Software Settings Policies for installing software on specific computers or on users' systems Windows Settings Policies for setting security parameters and running scripts at startup or shutdown of Windows Administrative Templates Policies for controlling the appearance and behavior of Windows Once you have selected a particular policy you want to alter, right-click it and select Properties You have the choice of disabling or enabling the policies listed in the right-hand frame In this example, we have enabled the Remove Documents Menu item in the Start Menu policy Now the Documents item will not be displayed in the Start menus of all users in the domain Now that we have covered some of the basic administrative tasks associated with users, we'll turn our attention to administration of the domain servers under Windows 2000

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verify that, with rigorous two-phase locking, transactions can be serialized in the order in which they commit Most database systems implement either strict or rigorous two-phase locking Consider the following two transactions, for which we have shown only some of the signi cant read and write operations: T8 : read(a1 ); read(a2 ); read(an ); write(a1 ) T9 : read(a1 ); read(a2 ); display(a1 + a2 ) If we employ the two-phase locking protocol, then T8 must lock a1 in exclusive mode Therefore, any concurrent execution of both transactions amounts to a serial execution Notice, however, that T8 needs an exclusive lock on a1 only at the end of its execution, when it writes a1 Thus, if T8 could initially lock a1 in shared mode, and then could later change the lock to exclusive mode, we could get more concurrency, since T8 and T9 could access a1 and a2 simultaneously This observation leads us to a re nement of the basic two-phase locking protocol, in which lock conversions are allowed We shall provide a mechanism for upgrading a shared lock to an exclusive lock, and downgrading an exclusive lock to a shared lock We denote conversion from shared to exclusive modes by upgrade, and from exclusive to shared by downgrade Lock conversion cannot be allowed arbitrarily Rather, upgrading can take place in only the growing phase, whereas downgrading can take place in only the shrinking phase Returning to our example, transactions T8 and T9 can run concurrently under the re ned two-phase locking protocol, as shown in the incomplete schedule of Figure 169, where only some of the locking instructions are shown T8 lock-S (a 1 ) lock-S (a 2 ) lock-S (a 2 ) lock-S (a 3 ) lock-S (a 4 ) unlock(a 1 ) unlock(a 2 ) lock-S ( an ) upgrade (a 1 ) Figure 169 Incomplete schedule with a lock conversion T9 lock-S (a 1 ).

For a Windows 2000 domain tree to function properly, the contents of the Active Directory must be updated to all domain controllers (DCs) in a timely fashion Windows 2000 employs multi-master replication techniques using Site Links to achieve consistent information among the peer DCs Note that all the connections discussed in this section run on top of an existing network infrastructure This infrastructure dictates which links are formed, who is a member of a given site, and how frequently you should schedule updates

You should take care w h e n removing redundant relationships, as removing a necessary relationship is a more serious error than retaining a redundant relationship W h e n in doubt, y o u should retain the relationship

The McGraw Hill Companies, 2001

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Instead of having one central database for the domain that is replicated to subordinate domain controllers, as is done in NT 40, Windows 2000 treats all domain controllers as peers You can update a record on any domain controller and expect that it will, after some time, update all domain controllers Replication is passed from one DC to another only when they have new information, and only the information that has changed is sent to the replication partner To tackle the issue of having information changed on one DC while it is being changed on another, domain controllers use timestamps and update sequence numbers (USNs) to track DC updates A USN is a 64-bit number that is advanced when a change is made to the Active Directory Each DC keeps track of the USNs of its replication partners When a replication is called, the DC requests all changes since the last time it received an update and then resets its USN for each of its replication partners If a DC attempts to update another DC with conflicting information, they both first check their USNs; the DC with the largest (most recent) USN will win and be replicated If the USNs are the same, then timestamps are used to determine which change was most recent (This is why it's important to keep all computers, especially DCs, synchronized to a standard clock)

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