SQL SERVER – Performance and Recompiling Query – Summary

Today is the first day of the year 2020 and I would like to share an interesting conversation that I have been having with many of the readers after reading the latest blog post series on Performance and Recompiling Query.

SQL SERVER - Performance and Recompiling Query - Summary RecompilingQuery-800x176

Before continuing this blog post, I strongly suggest that you read the following blog posts to get an understanding of the background of the concept which I am going to discuss today.

However, please note that avoiding parameter sniffing does not mean additional performance gain, it can very well reduce the performance as well.

After reading all the blog posts the common question which I had received was lots of people got confused what is the final solution to overcome slow query performance issues which are introduced due to the issue of the parameter sniffing.

Remember: It is extremely easy to overcome the problem of parameter sniffing. However, it is extremely difficult to overcome the performance problem which is introduced due to the parameter sniffing issue.

If your query is continuously misbehaving with the poor performance and you identify the issue is query cache, I think it is best to use the Recompiling Query while executing it. A common argument against this option is that it will actually forfeit the original purpose of the caching mechanism as well as also adds extra resources (CPU, Memory, IO) to each query. While I totally agree with the notion of more resource consumption, sometimes it just helps to recompile the query instead of running it with an incorrect plan.

Here is the syntax to recompile the query:

FROM WideWorldImporters.Sales.Orders
WHERE CustomerID = @CustomerID

So hear to the new year 2020 to recompiling query for performance.

Reference: Pinal Dave (https://blog.sqlauthority.com)

Parameter Sniffing, Query Hint, SQL Scripts, SQL Server, SQL Stored Procedure
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