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Figure 8-4 plots data independence vs. data consistency for various types of replication operations. Notice how the latency between updates differs between them.
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NOTE: In some situations, it is perfectly valid to combine different types of replication. The ultimate decision will be based on your business requirements and your technical and physical constraints.
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Now that we ve seen the various operations that might be required to set up and carry out replication, let s look at the actual processes that meet these requirements.
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To ensure that all of the necessary replication actions are performed, SQL Server includes the following four Agents, each of which is responsible for a specific action within the replication system: w Snapshot Agent Responsible for generating the information specified within the articles of a publication on a Publisher and storing it within the distribution database on the Distributor. This is the information that is potentially sent to Subscribers. Each Publication has its own Snapshot Agent, so snapshots can be generated on separate schedules for different types of information. Log Reader Agent Responsible for reading information from the transaction log of the necessary databases specified in a publication, if transactional replication is enabled. The Log Reader Agent is actually run on the Distributor, and each of the publications has its own Log Reader Agent. Distribution Agent Responsible for applying information stored in the distribution database to Subscribers. Depending on the type of replication chosen, the Distribution Agent may run on the Distributor or the Subscriber.
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Comparing various types of replication
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Merge Agent Responsible for determining and recording incremental data changes that occur on databases participating in replication. It does this by comparing the data in the initial snapshot that was created with the information in the database at the time the process runs. Depending on the specifics of the replication configuration, the Merge Agent may run on the Publisher or the Subscriber. The Merge Agent may, for example, run on the Subscriber if two-way replication is enabled.
These processes are executed as required by the replication configuration. The SQL Server Agent runs all the processes and is responsible for ensuring that they are performed as required. If, for some reason, SQL Server replication is not working properly, you should check the status of these Agents to pinpoint the problem. Now that we have a good understanding and overview of how SQL Server 7 replication works, let s move on to examine methods for actually implementing replication.
IMPLEMENTING SQL SERVER REPLICATION
In previous sections of this chapter, we discussed how to plan for replication and provided a detailed look at the various types of replication supported in SQL Server 7. In this section, it s time to apply that information in implementing and configuring the appropriate options. Before going on, however, be sure you understand which methods are best in your environment. It is usually a good idea to practice setting up replication on non-production servers and using test databases as misconfigurations might cause data loss or inconsistencies. Although the operations themselves are quite complex, SQL Server includes many Wizards that can be used for performing common tasks. With that in mind, let s start by describing how to enable replication.
Enabling Replication
Before you can configure replication options, you ll need to enable replication on an installation of SQL Server. Although the SETUP command, by default, installs all the features you ll need, replication is not enabled until you explicitly perform the following process. To enable replication using Enterprise Manager: 1. Click the name of a server. 2. In the right pane of Enterprise Manager, click the Replicate Data option. You ll see the options shown in Figure 8-5. 3. Click Configure Replication, which opens the Configure Publishing and Distribution Wizard. Click Next. 4. Choose Distributor Before you can configure replication, you must specify one server as the Distributor. On the Choose Distributor page of the wizard (shown in Figure 8-6), either make the current server a Distributor or connect to another server that already contains a distribution database. Click Next.
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