When working with large data sets, there is huge performance benefits to only updating rows that will receive a change. SqlTableDependency is a high-level implementation component to access notifications containing table record values on SQL Server database. However, when you update you need add a join to deleted. You could had multiple websites to the same mysql. Sending an update to myslq with the same value uses more resources, If there are no changes then send nothing You could almost think of it as a wrapper itself, and thus the need to be more concise in how I handle updates. I have an application that receives a number of values that need to be applied to various properties of an object (sealed class). So the original proposal amounts to 396 lock/unlock operations per second, while this new method amounts to only 264 lock/unlock operations per second of even lighter-weight locks. My real world example is as simple as that but gets called a lot. This worksbut it is hard to read, and now you need to keep track of which columns are nullable and which ones arent. To learn more, see our tips on writing great answers. Asking for help, clarification, or responding to other answers. A lighter alternative to Change Data Capture is Change Tracking. The other thing to note is that the EXCEPT operator treats the comparison of NULL values as equal. By looking at other examples I've come up with the following but it doesn't seem to work as I would like: I want it to only update the modified information if the QtyToRepair value has been updated but it doesn't do that. Please. Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? Rowversion / timestamp. On Amazon RDS, where IOPS are limited, there can be extremely strong performance benefits. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Generating points along line with specifying the origin of point generation in QGIS. Making statements based on opinion; back them up with references or personal experience. In my application, with a DB running on SQL Server 2012, I've got a job (scheduled task) that periodically executes an expensive query and writes the results to a table that can later be queried by the application.