Why Does My Stored Procedure Run Faster in SSMS Than in SqlCommand?

Performance Disparities with Stored Procedures: SqlCommand vs. SSMS

The execution time of a stored procedure can vary significantly between SQL Server Management Studio (SSMS) and System.Data.SqlClient.SqlCommand, even in the absence of parameter sniffing. The root cause may lie in the different SET options enabled by each execution environment.

By using SQL Server Profiler, it was discovered that SSMS executes several SET commands that the .NET Sql Client Data Provider omits. These SET options can influence the query plan and performance. One crucial SET option that emerged as the culprit in this case is:

SET ARITHABORT ON

When this SET option is enabled, queries with arithmetic operations that could potentially result in an overflow, division by zero, or other exceptional conditions will prematurely halt. This behavior differs from the default setting of SET ARITHABORT OFF, which allows the exception to occur.

As a result, the execution plan and performance of a stored procedure can be affected by the SET ARITHABORT option. If an arithmetic operation within the stored procedure is subject to this setting, it can lead to disparities in execution time between SSMS and SqlCommand.

To mitigate this issue, it is advisable to carefully review the SET options employed by applications that connect to SQL Server. By using the same SET options in SqlCommand as those used by SSMS, performance inconsistencies can be avoided. Additionally, leveraging the SQL Server Profiler to identify active SET options is a valuable debugging technique.

Other factors, such as connection string parameters, transaction behavior, and MARS (Multiple Active Result Sets) settings, can also impact performance and should be considered as potential contributing factors.

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