generate barcode in vb.net Lesson 1: Overview of Replication in Visual C#.NET

Create UPCA in Visual C#.NET Lesson 1: Overview of Replication

Lesson 1: Overview of Replication
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remote distributor. These topologies are still a central publisher or a central sub scriber, respectively; where the distributor is located is a physical implementation issue and does not belong in a business process flow diagram.
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Replication Agents
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When starting work with replication, many people are confused by the way the repli cation engine reacts to various failure scenarios. After all, SQL Server does not under stand how to time out a transaction or how to retry an operation. The fundamental thing to understand about replication is that it is not a part of the core SQL Server engine at all. Replication operates externally to the SQL Server engine via a set of executables known as Replication Agents, which make the replica tion engine simply another application that is connecting to SQL Server and process ing data. Because it is an application, the replication engine is bound by and reacts the same way as any application that has to form an OLE DB connection to SQL Server.
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Snapshot Agent
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The Snapshot Agent is actually snapshot.exe. This agent is responsible for extracting the schema and data that need to be sent from publisher to subscriber. Snapshot.exe is used in snapshot, transactional, and merge replication.
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The Log Reader Agent, logread.exe, is used only with transactional replication. It is used to extract committed transactions from the transaction log on the publisher that need to be replicated. Once extracted, the Log Reader Agent ensures that each trans action is repackaged and written into the distribution database in exactly the same sequence as the transaction was issued against the publisher. The sequencing by the Log Reader Agent is critical to ensure that transactions are not applied out of order to a subscriber.
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The Distribution Agent, distrib.exe, is used with snapshot and transactional replica tion. The Distribution Agent has two functions: applying snapshots and sending transactions. The Distribution Agent is responsible for applying each snapshot gener ated with snapshot or transactional replication to all subscribers. It is also responsible for applying all the transactions written to the distribution database by the Log Reader Agent to all subscribers.
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11
Replication
Merge Agent
The Merge Agent, replmerg.exe, is used with merge replication. The Merge Agent applies the snapshot generated when the subscriber is initialized. The Merge Agent is also responsible for exchanging transactions between the publisher and subscriber.
Queue Reader Agent
The Queue Reader Agent, qrdrsvc.exe, is used only when the queued updating option for transactional or snapshot replication has been enabled. The Queue Reader Agent is responsible for transferring the queue on the subscriber to the publisher.
Agent Profiles
Each replication agent has numerous configuration parameters that affect the behav ior. The 12 most common options are combined together into a single unit called an agent profile. Some of the more common options that you can configure are as follows:
Polling interval
Controls how frequently the agent checks for new transactions to replicate; default is 5 seconds Controls how long the agent waits for a query to complete; default is 1800 seconds
Query timeout
Login timeout
Controls how long the agent waits for a connection to be created; default is 15 seconds
Replication Methods
The replication engine has three different methods that you can use to replicate data: snapshot replication, transactional replication, and merge replication.
Snapshot Replication
Snapshot replication takes the entire set of data and sends it during each cycle of the replication engine. This is a full copy of the data that is applied to the subscriber. Any transactions that occurred against the publisher are captured and sent to a subscriber only the next time the snapshot runs. Snapshot replication uses the Snapshot Agent and the Distribution Agent. When the snapshot is initiated, the Snapshot Agent extracts the schema and bulk copies the data out to the snapshot folder by using BCP, the bulk copy program.
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