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Replication
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2. Contoso Limited needs to implement a replication architecture that will main tain a reporting server. A small number of changes might be made on the report server when corrections to reports are necessary that need to be sent back to the publisher. The reporting solution needs to be always available, even if the pub lisher is offline, while also providing the best performance. Which replication option is the best solution A. Transactional replication B. Transactional replication with immediate updating subscribers C. Merge replication D. Transactional replication with queued updating subscribers
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Lesson 2: Transactional Replication
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Lesson 2: Transactional Replication
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Transactional replication provides primarily one directional distribution of transac tions from a publisher to a subscriber. You can also deploy transactional replication in a variety of configurations as well as with multiple options. This lesson explains all the architectures into which you can deploy transactional replication. The lesson also explains some of the internal operations of transac tional replication.
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After this lesson, you will be able to:
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Design a high-availability solution that is based on replication.
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Specify an appropriate replication solution. Choose servers for peer-to-peer replication. Establish a strategy for resolving data conflicts. Specify the publications and articles to be published. Specify the distributor of the publication. Specify the subscriber of the publication.
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Design the topology of replication for archiving data.
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Estimated lesson time: 45 minutes
Change Tracking
Transactional replication is managed by using two replication agents: Log Reader Agent and Distribution Agent. The Log Reader Agent is responsible for moving changes from the transaction log on the publisher to the distribution database. The Distribution Agent is responsible for moving batches of changes from the distribution database to each subscriber.
Log Reader Agent
The Log Reader Agent performs the following steps during each cycle: 1. Connects to the distribution database and retrieves the replication watermark, the last Log Sequence Number (LSN) during the previous cycle, from the MSlogreader_history table. 2. Connects to the publisher s transaction log and locates the last LSN.
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Replication
3. Begins reading from the next LSN forward in the log until it reaches the oldest open transaction. 4. Writes transactions into the distribution database in MSrepl_commands and MSrepl_transactions, ensuring that all transactions are sequenced in exactly the same order as they were committed on the publisher. 5. Advances the replication watermark in the MSlogreader_history table. 6. Sets the replicated flag in the transaction log for each transaction that was suc cessfully written to distribution. 7. Logs error and history information to the distribution database.
Distribution Agent
The Distribution Agent performs the following steps during each cycle: 1. Connects to the distribution database and retrieves the last transaction applied to a subscriber from the MSdistribution_history table. 2. Gathers all the transactions pending for a subscriber. 3. Packages the transactions into batches. 4. Connects to the subscriber and applies each batch of transactions. 5. Updates the entry in the MSdistribution_history table with the last transaction sequence number that was applied. 6. Logs error and history information to the distribution database.
NOTE
Cleaning up the distribution database
The Distribution Agent does not directly clean up entries in the distribution database that have been successfully written to all subscribers. A separate job (referred to as the Clean Up Agent) runs on a periodic basis to remove transactions that have been sent to all subscribers. This job is sepa rated for performance purposes and enables the Distribution Agent to send transactions to sub scribers at a much higher rate than it takes for the Log Reader Agent to write transactions to the distribution database. This processing architecture ensures that the Distribution Agent does not become a bottleneck in the process, even when it must handle sending transactions to many sub scribers.
Database Impact
Because the replication engine guarantees that transactions written to the publisher are received by a subscriber, there is a significant impact to the published database that you must be aware of.
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