Category: Quick Tips
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In this video, Kevin Kline discusses why unwanted recompiles can hurt the performance of your SQL Server. He starts out by explaining why SQL Server keeps compiled code in the cache. Then he moves into the reasons why SQL Server will need to run a recompile on your code.
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In this video, Kevin Kline discusses the transitive property of indexes. He starts out by discussing how the transitive property works in algebra. Then he shares how the transitive property in algebra can be applied to Microsoft SQL Server.
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In this Quick Tip, Aaron Bertrand and Kevin Kline discuss queries that use IN(…) vs. queries that use OR. They use a demo to show how the two types of queries are interchangeable and how they both optimize to the exact same plan.
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Aaron Bertrand and Kevin Kline discuss some of the advantages for specifying the schema when creating, altering and referencing objects. They discuss how specifying a schema can affect performance and how important it is for security. They also use demos to illustrate the importance.
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Aaron Bertrand explains what the SP_ prefix is and discusses the performance issues with using it when you call a stored procedure. He also mentions a blog post he wrote about the SP_ prefix, which can be found at SQLPerformance.com/sp_prefix.
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Kevin Kline discusses how SQL Server wants to reuse execution plans but there are issues that can cause execution plans to never be reused. He also shares some examples of how to fix these issues which will help improve SQL Server performance.
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Aaron Bertrand discusses the issues of using the MERGE statement. He also gives a few ways to avoid using it.
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Aaron Bertrand discusses the issues of using the “Kitchen Sink” procedure, which is a stored procedure with massive dynamic search parameters. He shows examples of why the procedure is bad and ways to work around it.
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Aaron Bertrand goes over the differences between SP_EXECUTESQL and EXEC(...). He also provides a demo to show why he likes one more than the other.
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Aaron Bertrand goes over how to generate Ad-Hoc Sets efficiently. He shows examples of how to generate them using recursive CTEs, system tables and number tables and shows which way has the best performance.
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Kevin Kline discusses how the two types of temporary objects behave. He also shares some information on what they are good at and what they are not good at.
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Aaron Bertrand discusses one of his favorite topics, comma-delimited parameters. He shows the different ways you can split strings and which ways are the best.