Replication in Visual Basic .NET

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Replication
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for the @conflict_logging parameter of sp_addmergepublication. Each conflict table has the same structure as the article on which it is based, with the addition of the origin_datasource_id column. The Merge Agent deletes data from the conflict table if the data is older than the conflict retention period for the publication, which you can specify by using the @conflict_retention parameter of sp_addmergepublication. (The default is 14 days.) SQL Server 2005 replication provides the Replication Conflict Viewer and the stored procedures sp_helpmergearticleconflicts, sp_helpmergeconflictrows, and sp_helpmergedeleteconflictrows to view conflict data.
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Subscription Types and Conflict Tracking
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The following factors affect how the Merge Agent resolves a conflict it detects:
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Client or server (whether the subscription is a pull subscription or a push subscription does not affect conflict resolution)
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Type of subscription Type of conflict tracking Row-level, column-level, or logical record-level
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Subscription Types
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When you create a subscription, you specify whether it is a push or pull subscription and whether it is a client or server subscription. After a subscription is created, the type cannot be changed. (In previous versions of SQL Server, client and server subscriptions were, respectively, local and global subscriptions.) If you assign a fixed priority value (from 0.00 through 99.99), you create a server subscription. If you initially set a priority value of 0.00 but configure the subscription to assume and retain the priority value of the Publisher after synchronization, you create a client subscription. Subscribers with server subscriptions can republish data to other Subscribers. You can use client subscriptions when you want all Subscribers to have the same priority, and the first Subscriber to merge with the Publisher to win the conflict. When you change a row in a server subscription, SQL Server 2005 stores the subscription priority in the metadata for the change. This priority value travels with the changed row as it merges with changes at other Subscribers, ensuring that a change made by a higher priority subscription does not lose to a subsequent change made by a subscription with a lower priority.
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Delayed Conflict Notification
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Delayed conflict notification can occur with server subscriptions that have different conflict priorities for example, when changes are exchanged between the Publisher and a lower priority Subscriber that result in conflicting changes when
Lesson 1: Designing a Strategy to Manage Replication
a higher priority Subscriber later synchronizes with the Publisher. This situation can become problematic when the lower priority Subscriber has made changes to the same rows that are now conflict losers, resulting in a loss of all the changes made by this Subscriber. A potential solution to this problem is to ensure that all the Subscribers have the same priority, unless business logic dictates otherwise.
Tracking Level
Whether a data change qualifies as a conflict depends on the type of conflict tracking you set for an article: row-level, column-level, or logical record-level. When conflicts are detected at the row level, SQL Server 2005 assumes that changes made to corresponding rows are in conflict, regardless of whether the changes are made to the same column. For example, suppose a change is made to the address column of a Publisher row, and a second change is made to the name column of the corresponding Subscriber row in the same table. Row-level tracking detects a conflict because changes were made to the same row. Column-level tracking does not detect a conflict because changes were made to different columns in the same row. If a conflict is detected by either row-level or column-level tracking, the entire row of data is overwritten by data from the conflict winner.
SQL Server 2005 introduces logical record-level tracking. The method of detecting conflicts for logical records is determined by two article properties: column_tracking and logical_record_level_conflict_detection. You can set the logical_record_level_conflict_detection article property (for the top-level parent article only) to TRUE or FALSE. If this value is FALSE, merge replication detects conflicts based solely on the value of the column_tracking property for the article (as in previous versions of SQL Server). If the value is TRUE, merge replication will ignore the column_tracking property of the article and detect a conflict if changes are made anywhere in the logical record. If you are updating customer data that typically changes at several locations at the same time, you should choose row-level tracking. If you were to choose column-level tracking in this situation, SQL Server 2005 would not detect changes to the customer address in one location and to the customer name in another location as a conflict, the data would be merged on synchronization, and the error would be missed. Suppose, on the other hand, that your SQL Server enterprise contains two sites that have access to different types of statistical information for example, income level and total value of credit card purchases. In this case, you select column-level tracking to ensure that both sites can update statistical data for different columns without generating unnecessary conflicts.
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