Practice 7: Test the Replication Configuration in .NET

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Practice 7: Test the Replication Configuration
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In this practice, you corroborate that the snapshot publication has been delivered and that the tables and the stored procedure are stored in the SubsTesting database. 1. Using SSMS, connect to the server by using Windows authentication. (Use your standard Windows account.) 2. Expand the Databases, SubsTesting database.
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Lesson 3: Configuring Replication Security
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3. Expand the Tables folder and check that the three tables exist. 4. Expand the Programmability, Stored Procedures folder. 5. Right-click the uspGetBillOfMaterials stored procedure and choose Execute Store Procedure. 6. In the @StartProductID Value column, type 800. 7. In the @CheckDate Value column, type 2006-01-01. 8. Click OK. 9. Check that the procedure successfully runs and returns 88 rows.
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SQL Server 2005 includes a new security model that allows the configuration of the replication process by using different accounts that might have limited access to SQL Server. Replication agents should be configured with limited access to follow the principle of least privilege. This principle protects data and functionality from malicious users and ill-behaved applications. Using SSMS New Publication and New Subscription wizards, you can assign the Windows user accounts to run the agents, protecting your data and your server.
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Lesson Review
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The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. What is the purpose of the PAL A. Increase publication performance. B. Secure the publication. C. Provide a fault-tolerance mechanism. D. Increase subscription performance.
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Managing Replication
2. Which role membership level is the minimum necessary to subscribe to a publication (Choose all that apply.) A. db_datareader at the publishing database B. db_owner at the publishing database C. db_datawriter at the Subscriber database D. db_owner at the Subscriber database
Lesson 4: Configuring Conflict Resolution for Merge Replication
Lesson 4: Configuring Conflict Resolution for Merge Replication
Merge replication enables each server in the replication configuration to modify the data, later sending the changes to the distribution database. Therefore, in merge replication, conflicts might occur if two servers update the same data simultaneously. When you configure merge replication, you need to define the rules for how the Merge Agent should resolve any conflicts to maintain data validity and consistency. In this lesson, you will learn how to configure conflict resolution for merge replication and how to use the COM-based resolvers that come with SQL Server 2005 to resolve conflicts.
After this lesson, you will be able to:
Explain the need for conflict resolution in merge replication. Configure conflict resolution for merge replication. Use the COM-based resolvers supplied with SQL Server 2005.
Estimated lesson time: 40 minutes
Conflict Resolution Basics
Unlike transactional replication, merge replication does not rely on the transaction log to synchronize the Publisher and Subscribers. In merge replication, each server modifies the replicated data, and the replication process uses uniqueidentifier columns and triggers to capture database activity on each server. When the Merge Agent runs, changes to the data are synchronized between Publisher and Subscribers. If data has also changed in the Publisher or has changed in another Subscriber and is already applied to the Publisher, a conflict occurs.
MORE INFO
How merge replication works
If you are interested in understanding the internal workings of merge replication, read the How Merge Replication Tracks and Enumerates Changes section in SQL Server 2005 Books Online. Using this information, you can review the triggers code and table schema of merge replication tables and go inside the process.
Conflict Resolution Resolvers
When the Merge Agent is running, and the Publisher and Subscribers are connected, the agent detects any conflict that has occurred since the last synchronization
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Managing Replication
process. If the agent encounters a conflict, it uses a conflict resolver to determine the data that will be propagated to all participants. A conflict resolver is either a Microsoft .NET Framework business component that uses t he business logic handler framework included in t he namespace Microsoft.SqlServer.Replication.BusinessLogicSupport or a COM-based object that implements the ICustomResolver COM interface. These components are used to resolve merge replication conflicts. SQL Server 2005 provides 12 COM-based resolvers, which Table 19-3 describes.
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