Replication Agents in SQL Server 2008.

SQL Server Agent jobs are key components of replication. A number of SQL Agent jobs are created by replication.

1) Snapshot Agent: The Snapshot Agent is a SQL Agent job that takes and applies the snapshot either for setting up transactional or merge replication or for a snapshot replication.

2) Log Reader Agent: The Log Reader Agent is the SQL Agent job that reads the transaction log on the publisher and records the transactions for each article being published into the distribution database.

3) Distribution Agent: The Distribution agent is the SQL Agent job that reads the transactions written to the distribution database and applies them to the subscribing database.

4) Merge Agent: The Merge agent is the SQL Agent job that manages activities of Merge replication.

5) Other Agents: You may come across quite a few other SQL Agent Jobs, as described in the following list

a) Queue Reader Agent
b) History Agent
c) Distribution Cleanup
d) Expired subscription cleanup
e) Replication agent checkup
f) Reinitialize failed subscription agent
 

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