qr code generator using c# Understanding Active Directory Replication in Visual C#

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Understanding Active Directory Replication
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When you are planning site structure, it is important that you understand how replication works. As discussed previously, Active Directory uses two replication models; each of which is handled differently. The intrasite replication model is used for replication within sites and is optimized for high bandwidth connections. The intersite replication model is used for replication between sites and is optimized for limited bandwidth connections. Before I get into the specifics of replication and the replication models, let s look at the way replication has changed between Microsoft Windows 2000 and Windows Server 2003.
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Replication Enhancements for Windows Server 2003
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The replication model used for Windows Server 2003 has changed in several important ways from the model in Windows 2000. In Windows 2000, the smallest unit of replication is an individual attribute. At first examination, this seems to be what is wanted; after all, you don t
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Part 7: Managing Active Directory and Security
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Microsoft Windows Server 2003 Inside Out want to have to replicate an entire object if only an attribute of that object has changed. The problem with this approach is that some attributes are multivalued. That is, they have multiple values. An example is the membership attribute of a universal group. This attribute represents all the members of the universal group. In Windows 2000, by adding or removing a single user from the group, you caused the entire group membership to be replicated. In large organizations, a significant amount of replication traffic was often generated because universal groups might have several thousand members. Windows Server 2003 resolves this problem by replicating only the attribute s updated value. With universal group membership, this means that only the users you ve added or removed are updated, rather than the entire group membership. As discussed in the section entitled Extensible Storage Engine on page 1091, Active Directory uses transactional processing. When there are many changes, Active Directory processes the changes in batches of 5,000 at a time. This means that Active Directory processes a single transaction or multiple transactions in sequence until it reaches 5,000 changes, then it stops and checks to see if other processes are waiting for the CPU. Because a transaction must be completed before processing stops in this way, this places a practical limit on the number of changes that can be made in a single transaction that number is 5,000. In Windows 2000, because all the members of a group were processed any time a group s membership was changed, the limit on transactions also placed a practical limit on the number of members in a group. Again, this value is 5,000. The change in the way Windows Server 2003 replicates multivalued attributes also removes the limitation of 5,000 members for groups. Note When a forest is running at Windows Server 2003 functional level or Windows Server 2003 interim functional level, the members of the forest can take advantage of the previously discussed replication enhancements. For Windows Server 2003 functional level, this means that all domain controllers in all domains within the forest must be running Windows Server 2003. For Windows Server 2003 interim functional level, this means that all domain controllers in all domains within the forest must be running either Windows Server 2003 or Microsoft Windows NT.
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Other replication enhancements for Windows Server 2003 involve intersite replication. Windows Server 2003 introduces the ability to turn off compression for intersite replication and to enable notification for intersite replication. Windows Server 2003 also has an improved knowledge consistency checker (KCC), which allows Active Directory to support a greater number of sites. These changes affect intersite replication in the following key ways:
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In Windows 2000 and Windows Server 2003, all intersite replication traffic is com-
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pressed by default. Although this significantly reduces the amount of traffic between sites, it increases the processing overhead required on the bridgehead servers to replicate traffic between sites. Therefore, if processor utilization on bridgehead servers is a concern, and you have adequate bandwidth connections between sites, you may want to disable compression, which Windows Server 2003 allows you to do. 1172
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