Learn more about Parameter sniffing SSRS from our experts. Our SQL Server Support team is here to help you with your questions and concerns.

What is Parameter sniffing SSRS?

When we work with stored procedures in SQL Server, we have to be aware of the parameter sniffing concept.

According to our experts, it refers to the behavior of the query optimizer when generating an execution plan for a stored procedure based on its input parameters.

Although parameter sniffing can optimize query performance, it may also lead to unexpected issues that negatively impact the procedure’s execution.

Today, we are going to explore parameter sniffing in SQL Server and its implications.

When we call a stored procedure for the first time, the query optimizer creates an execution plan based on the input parameters. This plan is then stored in the plan cache for later executions of the same procedure. This helps the SQL Server avoid generating a new plan. In other words, it improves performance and resource utilization.

The Problem with Parameter Sniffing

Although reusing cached execution plans seems like a good idea, there is a downside to it. The plan may not be optimal for all parameter values. Some commonly seen symptoms due to parameter sniffing issues include:

• The stored procedure performs better in some cases but not in other cases.
• A decline in the procedure’s performance occurs.
• Updating the statistics improves the procedure’s performance.
• Recompiling the procedure statistics fixes performance issues.
• The procedure shows different performance for the same parameters when executed in SSMS compared to the application.
• Running the procedure’s query directly performs better than executing the stored procedure itself.

At the end of the day, Parameter sniffing plays a crucial role in SQL Server query optimization.

By understanding the symptoms and implications of parameter sniffing, we can identify and address any issues easily. This is why our experts recommend monitoring and analyzing execution plans, and other optimizations.

Let us know in the comments if you need further help with parameter sniffing. Our experts are happy to help resolve any issues that may have risen due to parameter sniffing.

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Conclusion

In brief, our Support Techs introduced us to Parameter sniffing in SSRS and the problems it may cause.