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In the previous section, you saw how HTTP endpoints are created to return data directly from an instance of SQL Server. This is all part of a new capability offered with SQL Server 2005, known as native XML Web services. Essentially, you are able to use HTTP and SOAP to deliver Web services from SQL Server 2005 directly. This enables you to bypass IIS and the need to create Web services using Visual Studio 2005.

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If you are creating endpoints on a Windows 2003 Server server, you do not need to have IIS installed. SQL Server 2005 will utilize the http.sys module in the Windows Server 2003 kernel.

To prevent transactions from looping between the two databases, you also must add the @loopback_detection parameter to each subscription. Although bidirectional replication can be accomplished as a subset of peer-to-peer replication, you can get some performance advantages. You do not need a separate distributor for each publisher or a rowguid column added to the tables participating in replication. The table structures can be different, although we have never encoun tered it. Data conflicts are not handled, and you must implement a bidirectional architecture using code. You cannot implement this architecture using a graphical user interface (GUI) to generate any of the components.

You commonly perform monitoring of replication architectures using the Replication Monitor. Within Replication Monitor, you can obtain statistics on the operational state of all publications, subscriptions, and agents. You can also view error and status history information to troubleshoot any issues that might be occurring. In previous versions, one of the most difficult questions to answer in a replicated environment dealt with bottlenecks. It was reasonably straightforward to determine how many transactions the replication engine was behind by executing the sp_browsereplcmds system stored procedure found in the distribution database. How ever, it was impossible to determine how long it would take the replication engine to catch up because timing information was not maintained across the environment. SQL Server 2005 introduced two important new features to the engine for monitor ing. As changes are moved by the Log Reader and Distribution Agents, the engine maintains statistics on the rate of data movement and how long it took to move data. By using these statistics, Replication Monitor can display continuous information that tells you how many transactions still need to be sent to subscribers as well as approx imately how long it will take to catch back up. Although the statistics in Replication Monitor provide good status information to determine how far behind subscribers are, it does not provide any granular detail. Replication Monitor displays a single statistic for the latency, but administrators can not tell whether the bottleneck is in the Log Reader Agent or whether the Distribution Agent is backing up. So tracer tokens were introduced to provide this granular detail.

Using Web services to host your SQL Server data is great when you have a large amount of data that needs to be retrieved quickly and efficiently. Examples of this include online product catalogs, staff listings, stock results, and music listings. The use of Web services can also be helpful in the generation of reports. You can easily create a stored procedure to generate the data needed and then expose it using Web services in SQL Server 2005. The data can then be consumed by another application or just embedded into an Excel document. By using Excel as the display mechanism, you do not have to worry about creating a special application that acts as an interface to your data. Only authenticated users are allowed to access your native XML Web services. There is no support for anonymous users, so all incoming SOAP requests must be authenticated. You can choose to handle security using the Windows user logon or the SQL Server logon. In the sample code created earlier, the endpoint was directed to use Windows authentication. If Windows authentication is used, no additional SOAP authentication headers are required. You only need to worry about additional SOAP authentication if you use SQL Server to autho-