Troubleshooting Plan Changes with Query Store in SQL Server 2016

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Watch the companion webinar at: Join John Sterrett, Senior Advisor at Linchpin People and Scott Walz, Director of Software Consultants, to learn how execution plans get invalidated and why data skew could be the root cause to seeing different execution plans for the same query. We will look at options for forcing a query to use a particular execution plan. Finally, you will learn how this complex problem can be identified and resolved simply using a new feature in SQL Server 2016 called Query Store.

Software

@JohnSterrett
Troubleshooting Plan Changes with
Query Store in SQL Server 2016

www.linchpinpeople.com 2
John Sterrett
@johnsterrett
John.Sterrett@linchpinpeople.com
Johnsterrett.com
linked.com/in/johnsterrett
google.com/+johnsterrett
Specialties / Focus Areas / Passions:
• Performance Tuning &
Troubleshooting
• Virtualization
• Infrastructure
• Architecture
• High Availability
• Disaster Recovery
• Health Monitoring
• Capacity Management
• License Efficiency
Linchpin People Group Principle
Leader Austin SQL
Server User Group
Leader Virtual Chapter
“High Availability and
Disaster Recovery”
PASS Regional Mentor

Life of an Execution Plan
Execute T-SQL
Does A Execution
Plan Exist?
Use The Execution Plan
in Cache
Yes, It Exists
Build Execution Plan
with Variables Used at
Runtime
No, Plan Doesn t Exist
Put Execution Plan in
Cache
11/12/2015 www.linchpinpeople.com 3

How Do I Detect Plan Recompile?
• Profiler
• Extended Events
• Dynamic Management Views (DMVs)
• Query Store (SQL Server 2016)
• TechNet – Execution Plan Caching and Reuse
11/12/2015 www.linchpinpeople.com 4

Reasons for Execution Plan Recompiles
• Changes made to a table or view referenced by the query (ALTER TABLE and ALTER VIEW).
• Changes made to a single procedure, which would drop all plans for that procedure from the
cache (ALTER PROCEDURE).
• Changes to any indexes used by the execution plan.
• Updates on statistics used by the execution plan, generated either explicitly from a statement,
such as UPDATE STATISTICS, or generated automatically.
• Dropping an index used by the execution plan.
• An explicit call to sp_recompile.
• Large numbers of changes to keys (generated by INSERT or DELETE statements from other users
that modify a table referenced by the query).
• For tables with triggers, if the number of rows in the inserted or deleted tables grows
significantly.
• Executing a stored procedure using the WITH RECOMPILE option.
11/12/2015 www.linchpinpeople.com 5

DEMO!
• Capture Execution Plan information
• Identify Queries with Changing Plans
• Learn how to freeze a plan with Plan Guides
11/12/2015 www.linchpinpeople.com 6

References
• Plan Guides (plan freezing) in SQL Server 2005/2008
• Plan Guides on Books Online
• Execution Plan Caching and Reuse

DEMO!
• Query Store in SQL Server 2016
• Find Top Offenders
• Identify Changing Execution Plans
• Easily Freeze an Execution Plan
• Internal DMVs
10

References
• Plan Guides (plan freezing) in SQL Server 2005/2008
• Plan Guides on Books Online
• Execution Plan Caching and Reuse
• Monitor Performance With Query Store (SQL 2016)

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At TECUNIQUE, we're a stable and steadily growing Indian software services company with over 14 years of industry experience. Specializing in offshore software development and quality assurance services, we've built a reputation for delivering unique and effective solutions to start-ups, software development companies, enterprises, and digital agencies. We pride ourselves on our commitment to excellence and innovation. By blending insightful business domain knowledge with exceptional technical prowess, we craft tailor-made solutions that meet the unique needs of our clients. Our dedicated teams are adept in specific technologies, ensuring seamless integration of skills and delivering reliable, scalable, and high-quality software solutions aligned with our clients' preferences. Bespoke Dedicated Teams: Crafted to meet your specific needs and technology preferences, our dedicated teams are committed to delivering top-notch software solutions. Offshore Software Development: Accelerate your software development and scale up quickly with our 12+ years of expertise in offshore development. Quality Assurance Services: Ensure the quality of your software products with our dedicated teams of experienced QA professionals. IT Staff Augmentation: Overcome skill gaps with our client-centric software team, offering staff augmentation services. Expert Software Services: Unlock our capabilities in custom software development, product development, and quality assurance. Mission and Vision: Our mission at TECUNIQUE is to be the catalyst for our clients' success in the dynamic domain of software development. Rooted in our core values of respect, authenticity, and responsibility, we strive to ease the software outsourcing experience, reducing both time and cost to market for our clients. We envision ourselves as the leading Indian software services company, renowned for our unwavering commitment to excellence and innovation. www.tecunique.com

TECUNIQUE: Success Stories: IT Service provider

mohitmore19

Tech Tuesday-Harness the Power of Effective Resource Planning with OnePlan’s ...

OnePlan Solutions

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Jhone kinadey

Introducing MyIntelliAccount™ Cloud Accounting Software as a Service (SaaS) , the complete system for simplifying business accounting needs. MyIntelliAccount Cloud Accounting SaaS is an easy to understand and easy to use application and system designed for the Web with supporting applications for iOS and Android devices. Designed to work like a natural extension of your web browser, the user interface for MyIntelliAccount Cloud Accounting SaaS is intuitive and thoughtfully organized to help you easily navigate and access your business accounting information. Because our company takes the time to research, study, and understand the applications we develop, we are confident that once you use MyIntelliAccount Cloud Accounting SaaS , you will be asking yourself how you ever got along without it.

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MyIntelliSource, Inc.

Data spaces in distributed environments should be allowed to evolve in agile ways providing data space owners with large flexibility about which data they store. Agility and heterogeneity, however, jeopardize data exchanges because representations may build on varying ontologies and data consumers may not rely on the semantic correctness of their queries in the context of semantically heterogeneous, evolving data spaces. Graph data spaces are one example of a powerful model for representing and querying data whose semantics may change over time. To assert and enforce conditions on individual graph data spaces, shape languages (e.g SHACL) have been developed. We investigate the question of how querying and programming can be guarded by reasoning over SHACL constraints in a distributed setting and we sketch a picture of how a future landscape based on semantically heterogeneous data spaces might look like.

Shapes for Sharing between Graph Data Spaces - and Epistemic Querying of RDF-...

Steffen Staab

A great deal of attention in medical devices has shifted towards cybersecurity with the ratification of section 524B of the FD&C act. This new law enables the FDA to enforce cybersecurity controls in any medical device that is capable of networked communications or that has software. In this webinar we will recap the process for managing vulnerabilities, identify categories of vulnerabilities and solutions and more.

The Real-World Challenges of Medical Device Cybersecurity- Mitigating Vulnera...

ICS

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ComplianceQuest1

Test automation is a cornerstone of software development and quality assurance in today's rapidly evolving digital landscape. Its significance cannot be overstated. Businesses can enhance efficiency, productivity, and accelerate software delivery to market through automation, streamlining testing processes effectively. This comprehensive guide addresses the best practices for test automation in 2024. It offers a detailed checklist to empower you to optimize your automation efforts and maintain a competitive edge.

The Ultimate Test Automation Guide_ Best Practices and Tips.pdf

kalichargn70th171

Conference: Engage2024 in Antwerp Type: Workshop Speakers: Florian Vogler, Henning Kunz, Christoph Adler Title: Navigating the Future with The Hitchhiker's Guide to Notes and Domino 14 Abstract: Embark on an exhilarating journey with industry trailblazers Florian Vogler, Henning Kunz, and Christoph Adler in this not-to-be-missed workshop at the forefront of the tech universe. Get ready for a thrilling kick-off as we navigate the current state of the HCL universe, setting the stage for an exploration of the groundbreaking Notes and Domino 14. Discover the latest enhancements and revolutionary features that will redefine your experience. In this interactive session, unlock a treasure trove of tips and tricks to elevate your utilization of version 14, both with and without the game-changing panagenda MarvelClient. Brace yourself for also diving into Nomad, Nomad Web, and VoltMX, expanding your horizons in the expansive HCL landscape. Be a part of this exclusive opportunity to stay ahead in the ever-evolving world of HCL technologies. Your journey to mastering Notes and Domino 14 begins here. And remember, in the spirit of intergalactic exploration, don't forget to bring your towel!

W01_panagenda_Navigating-the-Future-with-The-Hitchhikers-Guide-to-Notes-and-D...

panagenda

Diamond Application Development Crafting Solutions with Precision

SolGuruz

Unlocking the Future of AI Agents with Large Language Models

aagamshah0812

SyndBuddy AI 2k Review 2024: Revolutionizing Content Syndication with AI

ABDERRAOUF MEHENNI

5 Signs You Need a Fashion PLM Software.pdf

Wave PLM

Learn the Fundamentals of XCUITest Framework_ A Beginner's Guide.pdf

kalichargn70th171

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HR Software Buyers Guide in 2024 - HRSoftware.com

Fatema Valibhai

How To Use Server-Side Rendering with Nuxt.js

Andolasoft Inc

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