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Lesson 1: Overview of Replication
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Minimally logged transactions
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If a database is participating in replication, you must be extremely careful with the Bulk-Logged and Simple recovery models. When a database is placed in the Bulk-Logged or Simple recovery models, minimally logged transactions can be executed. These types of transactions only log page alloca tions and deallocations into the transaction log; they do not fire triggers. The five minimally logged transactions are the following:
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CREATE INDEX TRUNCATE TABLE BULK INSERT BCP SELECT INTO
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Replication is concerned with only three of these operations TRUNCATE TABLE, BULK INSERT, and BCP because each affects data within a table. If the database is placed into the Simple or BulkLogged recovery model, and if any of these operations is executed, the replication engine cannot pick up the changes because transactional replication relies on transactions in the transaction log, and merge replication relies on triggers.
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1. What are the three methods of replication 2. What are the five agents used in replication 3. What are the three types of data conflicts 4. What are the two roles a database can have within a replication architecture 5. What are the core components of replication
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1. Snapshot, transactional, and merge. 2. Snapshot Agent (snapshot.exe), Log Reader Agent (logread.exe), Distribu tion Agent (distrib.exe), Merge Agent (replmerg.exe), and Queue Reader Agent (qrdrsvc.exe). 3. Insertion of a duplicate primary key, update conflict, and update of a non existent row. 4. Publisher or subscriber. 5. One or more articles are combined into a publication that forms the basis of a replication session. The articles can optionally have filters applied to them.
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11
Replication
Practice: Configuring Publishing
In this exercise, you configure publishing on your instance of SQL Server.
NOTE
Learning replication
The exercises in this chapter configure a replication environment using the settings that we always recommend when learning replication. You configure the publisher, subscriber, and distributor all within the same instance which has the effect of replicating between two databases on the same instance. This is the most straightforward way to learn replication because it eliminates the two most common causes of configuration issues in replication: security and connectivity.
1. Open Microsoft SQL Server Management Studio (SSMS), and connect to your instance in the Object Browser. 2. Right-click the Replication node, and choose Configure Distribution. Click Next. 3. Select the option radio button for your instance to act as its own distributor, and then click Next. 4. Leave the snapshot folder set to the default value, and then click Next. 5. Leave the name and location of the distribution database set to the default val ues, and then click Next, as shown in Figure 11-4.
Figure 11-4 Distribution database settings
6. Ensure that your instance is selected for the publisher, and click Next.
Lesson 1: Overview of Replication
7. Verify that the Configure Distribution check box is selected, and click Next. 8. Click Finish to enable publishing, and then click Close. 9. Verify that you now have a database named distribution created on your instance.
Lesson Summary
One or more articles can be combined into a publication to form the definition of the data set that will be moved by the replication engine. A database can be in the role of publisher, subscriber, or both. There are three methods of replication: snapshot, transactional, and merge. Five agents perform all the work of the replication engine: Snapshot Agent, Log Reader Agent, Distribution Agent, Merge Agent, and Queue Reader Agent. In situations in which changes can be made at both the publisher and the sub scriber, data conflicts can result.
Lesson Review
You can use the following questions to test your knowledge of the information in Les son 1, Overview of Replication. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
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. Contoso Limited needs to implement a replication architecture that will main tain a reporting server while also ensuring that any changes to the report server do not get sent back to the publisher. Which replication option is the best solution A. Transactional replication B. Snapshot replication C. Merge replication D. Peer-to-peer replication
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