Allowing updates at the Subscriber in Visual Basic .NET

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Allowing updates at the Subscriber
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By default, Subscribers to transactional publications should be treated as read-only, because changes are not propagated back to the Publisher. However, transactional replication does offer options that allow updates at the Subscriber. For more information, search for Publication Types for Transactional Replication in Books Online or access msdn2.microsoft.com/en-us/library/ ms152570(d=ide).aspx.
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Merge Replication
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Merge replication typically starts with a snapshot of the publication database objects and data. Subsequent data changes and schema modifications made at the Publisher and Subscribers are tracked by using triggers. The Subscriber synchronizes with the Publisher and exchanges all rows that have changed between the Publisher and Subscriber since the last time synchronization occurred. Merge replication is typically used in server-to-client environments and is appropriate in any of the following situations:
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Multiple Subscribers might update the same data at various times and propagate those changes to the Publisher and to other Subscribers.
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Lesson 1: Designing a Strategy to Manage Replication
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Subscribers need to receive data, make changes offline, and later synchronize changes with the Publisher and other Subscribers. Each Subscriber requires a different partition of data. You need to be able to detect and resolve conflicts. The application requires net data change rather than access to intermediate data states. For example, if a row changes several times at a Subscriber before it synchronizes with a Publisher, the row will change only once at the Publisher to reflect the net data change (that is, the final value).
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Merge replication allows various sites to work autonomously and subsequently to merge updates into a single, uniform result. Because updates are made at more than one node, the same data might have been updated by the Publisher and by more than one Subscriber. Therefore, conflicts can occur when updates are merged, and merge replication provides a number of ways to handle conflicts.
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Detecting and resolving merge replication conflicts
For more information about how merge replication detects and resolves conflicts, search for Detecting and Resolving Merge Replication Conflicts in Books Online or access msdn2.microsoft.com/ en-us/library/ms151191(d=ide).aspx.
Using Triggers, Constraints, and NOT FOR REPLICATION A trigger is a type of stored procedure that automatically takes effect when a language event executes. When a data definition language (DDL) event takes place in a server or database, it can invoke a DDL trigger (introduced in SQL Server 2005). When a data manipulation language (DML) event takes place in the database, it can invoke a DML trigger.
DML events include INSERT, UPDATE, or DELETE statements that modify data in a specified table or view. A DML trigger can query other tables and can include complex Transact-SQL statements. The trigger and the statement that fires it are treated as a single transaction, which can roll back from within the trigger. Because of SQL Server 2005 integration with the .NET Framework common language runtime (CLR), you can use any .NET Framework language to create CLR triggers. You can, for example, create a trigger that prints an invoice when a new sale is entered into a sales database. You need to take care to configure triggers appropriately when you are setting up replication. Suppose, for example, that your organization has several sales outlets, each with its own SQL Server 2005 server, that replicate sales data with a central office
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Replication
by using merge replication, and each outlet has implemented a trigger that initiates an invoice for local sales. You want to replicate sales data, but you do not want the trigger to operate on data from other outlets that replicates to an outlet from the central office. You would therefore configure the trigger on the server in each sales outlet to use the NOT FOR REPLICATION (NFR) clause. The NOT FOR REPLICATION clause stops SQL Server from executing the trigger when a replication agent modifies the table upon which the trigger is configured. It does not stop the trigger from being published as a part of SQL Server replication. If you do not want to replicate a trigger, you can use the WITH ENCRYPTION clause. You can use CHECK constraints to prevent users from entering data in an incorrect format. For example, if a product code is always six characters long, a CHECK constraint can prevent a user from entering a code of the incorrect length. If you do not want to replicate constraints, you can use the NOT FOR REPLICATION clause on the table on the Publisher that contains the constraint. A FOREIGN KEY constraint allows certain fields in one table to refer to fields in another table. You can also use the NOT FOR REPLICATION clause to prevent the replication of FOREIGN KEY constraints. Notice that the NOT FOR REPLICATION clause limits the operation of triggers but does not prevent their replication. However, it does prevent the replication of constraints.
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