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Page History: Database Command Timeouts: Performance Differences between .NET and Management Studio

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Page Revision: Wed, Jan 04, 2012, 3:15 PM


Overview

Why are there performance differences when a SQL statement is called from .NET app vs when the same call is made in Management Studio?

This is usually because you are getting a different execution plan in your SSMS connection. Often related to parameter sniffing issues where when the plan gets generated with a specific value that is sub optimal for other values of the parameters. This also explains why recompiling would resolve the issue.


Resolution

  • Google "parameter sniffing SQL Server"
  • If it's just one stored procedure, recompile it, then immediately run it in Management Studio with the parameters of interest.

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