Fixing SQL Server Transactional Replication Performance Issues

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The SQL Server transaction replication allows you to distribute your transaction details from one server to another server. It’s a good tool that lets the developers to scale your transactions between two or more servers. It works well in a small scale, but, if the transactions are in a huge amount , the performance of SQL Server transaction replication is slow down. In this article I will discuss the SQL Server Transactional replication performance issues and its troubleshooting ideas.

Issues with Transaction Replication Performance

In SQL Server transaction replication, the performance issues, mainly arise between the publisher and subscriber. The issue that occurs between publisher and subscriber is the latency or delay of the transactions. This may cause the slow performance of transaction replication between two or more servers. Sometimes, the cause of a slow performance may be a bad Input/output capacity on the subscriber side, blocking on the distribution agent or a high number of virtual log files, that may slow the performance of SQL Server transaction replication. So in such scenario we need to perform some major tasks for its troubleshooting.

Troubleshooting Transactional Replication Performance Issues Check delay from publisher to distributor to subscriber by using tracer tokens Troubleshoot the data issues by using agent logging to external files. If there is blocking issue, then apply the blocked process trace definition. Use the Row Filters if the replication setup not able to handle the full dataset. Check the number of virtual log files, they can also be the cause of delay. Check DMV stats for waiting resources, which helps, you can find the bottleneck. Check msdistribution_history, msrepl_errors & mslogreader_history in distribution database Check the transactional replication performance monitor counters. To optimize transaction replication in SQL Server, Avoid unnecessary data to publish. This will helps to reduce the unnecessary network traffic and increase the performance of transaction replication. Try to maintain both published and distribution database log on different disk drives. Do not set distribution database to grow automatically, it must be set to a fixed size. Manage the replication activities, and try to place them on their own dedicated server, because they can be the cause of the interruption. Do not run the snapshot agent repeatedly, because it copies data from publisher to distributor which will impact on its performance and degrade it. Use the replication at regular intervals instead of using it continuously. Conclusion:

The article describes transaction replication performance issues, In which we know the major causes that slow down the performance of transaction replication and also their troubleshooting mechanism. I discussed too many virtual log files can be the cause of delay, because they increase the network traffic and the low disk space may also the cause of its bad performance.