Understanding Parameter Sniffing
Parameter sniffing is a good thing: it is used by the Query Optimizer to produce an execution plan tailored to the current parameters of a query. However, due to the way that the plan cache stores these plans in memory, sometimes can also be a performance problem. This session will show you how parameter sniffing works and in which cases could be a problem. How to diagnose and troubleshoot parameter sniffing problems and their solutions will be discussed as well. The session will also include details on how the Query Optimizer uses the histogram and density components of the statistics object and some other advanced topics.
Benjamin Nevarez is a database professional based in Los Angeles, CA, and author of “Inside the SQL Server Query Optimizer”. He has also contributed to other SQL Server books including “SQL Server 2012 Internals”. Benjamin has 20 years of experience with relational databases and has been working with SQL Server since version 6.5. He holds a Master’s Degree in Computer Science and has been a speaker at many SQL Server conferences, including the PASS Summit and SQL Server Connections. Benjamin’s blog is at http://www.benjaminnevarez.com and can be reached by e-mail at admin at benjaminnevarez dot com and on twitter at https://twitter.com/BenjaminNevarez.
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