c# print 2d barcode Lesson 3: Merge Replication in C#

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Lesson 3: Merge Replication
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1. MSmerge_contents and MSmerge_genhistory. 2. The merge engine uses the metadata to determine the changes that need to be applied. Because both publisher and subscriber maintain a full history of all changes, and the metadata is stored within the same database partic ipating in replication, backup/restore processes keep the metadata syn chronized with the data being replicated. This ensures that the merge engine can recover, even from a restore operation, and incrementally resyn chronize itself.
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Practice: Implementing Merge Replication
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In these exercises, you configure merge replication using the AWMerge database.
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Exercise 1: Creating a Merge Publication
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In this exercise, you will create a merge publication. 1. Create a database named AWMergeSubscriber on the same instance as the AWTransactional database. 2. Right-click the Replication node in Object Explorer, and choose Publication on the New menu. Click Next. 3. Select the AWMerge database, and click Next. 4. Select Merge Publication, and click Next. 5. Verify that the SQL Server 2005 check box is selected, and click Next. 6. Select all the tables and UDFs, just as you did when creating the transactional publication in the previous lesson, and click Next. 7. Click Yes to confirm that you want to add uniqueidentifier columns to the tables as needed. 8. Click Next again. You will not be filtering any rows, so click Next. 9. Verify that the Create A Snapshot Immediately check box is selected, and clear the Schedule The Snapshot Agent To Run At The Following Times check box. Click Next. 10. Specify security settings as you did when creating a transactional publication, and click Next.
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Replication
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11. Verify that the Create The Publication check box is selected, and click Next. 12. Specify a name for your publication, and click Finish. After the publication is cre ated, click Close. 13. Inspect the AWMerge database to view all the changes that have been made to triggers, stored procedures, table structures, indexes, and views to support the change tracking in merge replication.
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Exercise 2: Creating a Merge Subscription
In this exercise, you will create a subscription to the merge publication. 1. Expand Local Publications, right-click the publication you just created, and choose New Subscriptions. 2. Select your merge publication, and click Next. 3. Verify that the option for Run All Agents At The Distributor is selected, and click Next. 4. Select the check box next to your instance, and select the AWMergeSubscriber database from the Subscription Database drop-down list. Click Next. 5. Click the ellipsis button next to your subscriber in the Subscription Properties window. 6. Select the option for Run Under The SQL Server Agent Service Account, along with both options for By Impersonating The Process Account. Click OK, and then click Next. 7. On the Synchronization Schedule page, select Run Continuously from the Agent Schedule drop-down list, and click Next. 8. Leave the Subscription Properties at Initialize Immediately and click Next. 9. Leave the defaults for the Subscription Type Of Server with a priority of 75.00. Click Next. 10. Verify that the Create Subscription(s) check box is selected. Click Next, and then click Finish. 11. After the subscription is created, click Close. 12. Use Replication Monitor to inspect the agents, history, and any error messages. 13. Inspect the AWMergeSubscriber database to view the objects created when the snapshot was applied.
Lesson 3: Merge Replication
14. Make changes to both the publisher and subscriber, and observe how the data moves through the engine. 15. Introduce data conflicts, and observe how they are detected and resolved.
Lesson Summary
The merge engine provides a powerful and resilient engine for distributing changes because it was designed for mobile, disconnected users. The design specifications to handle mobile, disconnected users can be applied in a server-to-server environment because the merge engine is already coded to handle significant amounts of downtime and unpredictable data synchroniza tion. The change tracking occurs in a set of metadata tables that are within the same database that is being published or subscribed. Because both publisher and subscriber maintain a complete copy of all changes that were made, the merge engine can make one simple request during each cycle: Send me everything that I do not already have.
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