Now, it’s your turn: I’ll give you a query that is experiencing parameter sniffing problems, and some examples of different parameters that seem to trigger problems. Your mission is to implement branching (to reduce the blast radius. Restore your Stack Overflow database to the starting point where you have the necessary indexes, and then run…
1.6 Lab 2: Reducing Sniffing by Caching Multiple Plans
Now, it’s your turn: I’ll give you a query that is experiencing parameter sniffing problems, and some examples of different parameters that seem to trigger problems. Your mission is to implement branching (to reduce the blast radius. Restore your Stack Overflow database to the starting point where you have the necessary indexes, and then run...
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- 0.1 Prerequisites Before the Class
- 0.2 Download the Slides and Scripts
- 1.1 How Index Tuning Reduces the Stench
- 1.2 How Query Hints Reduce the Stench
- 1.3 The Drawbacks of Using Recompile Hints
- 1.4 Lab 1: Get One Plan to Work Well Enough for Most
- 1.5 Bad Branching Causes Sniffing, Good Branching Reduces It
- 2.1 Spotting Wild Variations in the Plan Cache
- 2.2 How Freeing the Plan Cache Reduces the Blast Radius: usp_PlanCacheAutopilot
- 2.3 Tracking Even More Plan Cache Details with Query Store
- 2.4 Lab 3: Track Down Plans & Parameters
- 3.1 How Memory Grant Feedback Multiplies Parameter Sniffing
- 3.2 How Adaptive Joins Help, and How to Get Them
- 3.3 How Automatic Tuning Mitigates Parameter Sniffing
- 4.1 Lab 4 Setup: Fixing the Problems You’ve Been Tracking Down
- 4.2 Tuning usp_SearchPostsByPostType
- 4.3 Tuning usp_RptFastestAnswers
- 4.4 Tuning usp_SearchPostsByLocation
- 4.5 Tuning usp_RptQuestionsAnsweredForUser
- 4.6 Tuning usp_SearchUsers
- 4.7 Tuning usp_RptPostLeaderboard
- 4.8 Tuning usp_RptAvgAnswerTimeByTag
- 4.9 Tuning usp_GetTagsForUser
- Bonus Lab: Seeing the Effects of SQL Server 2019 Compat Mode
- Bonus: Storytelling Time