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Queue Reader Agent (replmerg.exe) This agent reads messages stored in queues
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(SQL Server queues or Microsoft Message Queues) and applies transactions sent to the queue to the Publisher database. The Queue Reader Agent is used only when snapshot or transactional replication is set with the option for queued updating subscriptions.
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Queued updating subscriptions
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When you use queued updating subscriptions, SQL Server stores the changes in a queue and then applies the queued transactions asynchronously at the Publisher whenever network connectivity is available. Lesson 2 covers the parameter for setting up updatable subscriptions, but full coverage of queued updating is beyond the scope of this chapter. For complete information, see the Updatable Subscriptions for Transactional Replication topic in SQL Server 2005 Books Online.
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SQL Server 2005 also includes agents responsible for replication maintenance jobs, including:
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Agent History Clean Up: Distribution Distribution Clean Up: Distribution Expired Subscription Clean Up Reinitialize Subscriptions Having Data Validation Failures Replication Agents Checkup Replication Monitoring Refresher For Distribution
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Which agent is responsible for delivering the snapshot files to the Subscriber in transactional replication The Distribution Agent (distrib.exe) delivers the snapshot files to Subscribers in a transactional replication architecture.
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Lesson 1: Understanding Replication Types
Lesson Summary
SQL Server 2005 includes three main replication types: snapshot, transactional, and merge. SQL Server uses a magazine publishing metaphor to describe the elements of a replication topology, including articles, publications, Publishers, Distributors, and Subscribers. Replication involves one of two types of subscriptions: push subscriptions, which run at the Distributor and send the publication to the Subscribers; and pull subscriptions, which run at the Subscribers and retrieve the publication from the Distributor. Replication uses executables called agents to manage the replication process. The main replication agents are the Snapshot Agent, the Log Reader Agent, the Distribution Agent, the Merge Agent, and the Queue Reader Agent.
Lesson Review
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.
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. Which replication types rely on the transaction log to monitor changes in the publishing database (Choose all that apply.) A. Snapshot replication B. Transactional replication C. Merge replication D. Peer-to-peer replication 2. Which of the following agents is responsible for monitoring the transaction log in transactional replication A. Snapshot Agent B. Distribution Agent C. Merge Agent D. Log Reader Agent
19
Managing Replication
Lesson 2: Setting Up Replication
The most straightforward method to configure replication is via SSMS. But you can also use Transact-SQL statements or SQL Server RMOs to configure replication. The general steps for configuring replication are as follows: 1. Set up a Distributor for the Publisher to use. 2. Create a publication to replicate that includes the articles you want to copy. 3. Configure the Subscriber and a subscription. In this lesson, you see how to use SSMS to perform these steps to configure a replication topology. You also see how to generate the equivalent Transact-SQL configuration scripts.
After this lesson, you will be able to:
Create the distribution database. Enable a database for replication. Create a publication. Subscribe to a publication.
Estimated lesson time: 40 minutes
How to Set Up the Distributor
The first step in setting up replication is configuring the Distributor. You can assign each Publisher to only one Distributor instance, but multiple Publishers can share a Distributor. As noted earlier, you can configure the Distributor server to act as the distributor of its own data (local Distributor), which is the default, or as a distributor of data for remote servers (remote Distributor).
BEST PRACTICES
Remote Distributor
You might decide to use a remote Distributor if you want to offload the Distributor processing from the Publisher computer to another computer or if you want to configure a centralized Distributor for multiple Publishers.
Note that the server you choose as the Distributor should have adequate disk space and processor power to support replication and the other activities that need to run on that server.
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