Managing Replication in .NET framework

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Managing Replication
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Log Reader Agent Publisher Data Transaction Log Distribution Database
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Subscriber Distribution Agent
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Figure 19-5 Transactional replication
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New in SQL Server 2005: peer-to-peer replication
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Peer-to-peer replication is a new kind of transactional replication that lets multiple servers subscribe to the same schema and data, permitting simultaneous changes in multiple servers. For information about peer-to-peer replication, see the SQL Server 2005 Books Online topic Peer-to-Peer Transactional Replication. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/ prodtechnol/sql/2005/downloads/books.mspx.
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Transactional replication offers a valuable alternative to snapshot replication when your data is volatile, but it has an important limitation: Transactional replication limits the changes that data can undergo at the destination, and only through a separate communication mechanism can the information updates at the Subscriber database reach the Publisher database. When your environment requires the ability to support simultaneous data modifications in the Publisher and Subscriber databases, merge replication (illustrated in Figure 19-6) offers a solution. With merge replication, the process begins with an initial full copy of the data from the Publisher to the Subscribers. As data changes occur in any server, the replication process takes these changes, resolves any conflicts that might have occurred due to the changes, and applies the changes to all the servers. Unlike transactional replication, merge replication does not rely on the serialization of the database (the transaction log) to synchronize the Publisher and Subscribers. In merge replication, each server modifies the replicated data, and the merge replication process uses a combination of unique identifier columns, triggers, and tables to capture changes in the database. Note that merge replication is the most invasive replication solution because it requires important schema changes in the database.
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Lesson 1: Understanding Replication Types
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Publisher
Data Merge Agent
Subscriber Data
Conflict Resolution
Figure 19-6 Merge replication
Replication Agents
SQL Server uses a group of programs called replication agents to execute the replication process. Replication agents, by default, are implemented through SQL Server Agent jobs. SSMS replication wizards automate the creation of these jobs. You can also run replication agents from the command line or from applications that use RMO. You manage replication agents from SSRM (covered in Lesson 5) and SSMS. SQL Server 2005 replication includes the following key agents:
Snapshot Agent (snapshot.exe) This agent prepares the schemas and the initial
copy of the data files. All replication types use the Snapshot Agent as the starting point for the synchronization process. Generally, the Snapshot Agent is run on a regular basis to keep the data files updated. These files are required if the replication synchronization process finds anomalies in the data that cannot be fixed. The Snapshot Agent runs in the Distributor server.
Log Reader Agent (logread.exe)
This agent monitors the database s transaction log and copies each transaction that affects the publication to the distribution database, in which the transactions are stored until applied to the Subscribers. It is important to note that multiple publications of the same database share the same Log Reader Agent. Log Reader Agents are used only in transactional replication configurations and run in the Publisher server.
This agent performs two tasks: it delivers the initial snapshot to Subscribers and applies transactions stored in the distribution database to Subscribers. The Distribution Agent is used in snapshot and transactional replication. The Distribution Agent runs in the Distributor when you configure the publication as a push subscription and in the Subscriber when you configure the publication as a pull subscription.
Distribution Agent (distrib.exe)
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Managing Replication
Merge Agent (replmerg.exe) This agent delivers the initial snapshot from the Dis-
tributor to the Subscribers. It also merges data changes that occur in the Publisher to the Subscribers, and vice versa. When two servers modify the same information at the same time, a conflict occurs; the Merge Agent reconciles the conflict by using a set of rules that you define during replication configuration. The Merge Agent runs in the Distributor when you configure the publication as a push subscription and in the Subscriber when you configure the publication as a pull subscription.
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