Execution Plans in practice - how to make SQL Server queries faster - Damian Widera

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The document discusses a presentation by Damian Widera on making SQL Server queries faster. It covers topics like what can make query execution bad, such as full table scans instead of index seeks. It also discusses how to identify issues like unnecessary sorting, hashing, or spools, and when scans may be preferable to seeks. The presentation notes that SQL Server 2016 introduces Query Store, which collects runtime statistics to help troubleshoot performance issues.

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Execution plans in practice – how to
make SQL Server queries faster
Damian Widera
Microsoft Data Platform MVP
EUVIC
@damianwidera
http://sqlblog.com/blogs/damian_widera/default.aspx

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Customers…

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• What is bad in terms of query execution
• What was bad in previous examples is not always
bad…
• SQL Server 2016 – how could it help?
Today I am going to tell about….

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SQL Server School of Art

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• A query takes long time to execute
• A query consumes too much resources
• Then we have:
–Reduced concurency
–More locks that should be
• Locks contentions, waits, etc…
What is bad in terms of query execution

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• A query (logical) is parsed and optimized based on
all available information (cost optimization)
• Estimation != Guestimation
• Plan(s) is (are) produced
How it works

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Bad row estimates can impact a variety of decisions
including:
• index selection seek vs. scan operations,
• parallel versus serial execution,
• join algorithm selection,
• inner vs. outer physical join selection (e.g. build vs.
probe),
• spool generation,
• bookmark lookups vs. full clustered or heap table access,
• stream or hash aggregate selection
Why it is so important?

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• Index or table scans (*): May indicate a need
for better or additional indexes (*)
– THIS IS NOT ALWAYS WRONG!!!!
• Bookmark Lookups: Consider changing the current
clustered index, consider using a covering index, limit the
number of columns in the SELECT statement.
• Filter: Remove any functions in the WHERE clause, don’t
include views in your Transact-SQL code, may need
additional indexes.
What to look for…

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• Sort: Does the data really need to be sorted? Can an index
be used to avoid sorting? Can sorting be done at the
client more efficiently? „Hidden” sort. Nonlinear
operation
• Spool. Used as a cache in the QP. Reason – lack of indexes
or uniqueness. Implemented as a hidden tables in tempdb
• Hash. Used for joins and aggregations. Builds a hashtable
in memory (or in tempdb). Means there is no good index.
What to look for…

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• When index scan is the best option
–Two examples
• High density -> Seek
• Low density -> Scan
• When cursor can be the best option (especially for
SQL Server 2008 R2 and older)
–Running total
What was bad in previous example is not always bad…

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New functionality that makes DBAs’ happy - Query
Store
will be available in all editions
SQL Server 2016 – how could it help?

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Query data store
Durability latency controlled by DB option
DATA_FLUSH_INTERNAL_SECONDS
Compile
Execute
Plan store
Runtime stats
Query Store
schema
Collects query texts (plus all
relevant properties)
Stores all plan choices and
performance metrics
Works across restarts /
upgrades / recompiles
Dramatically lowers the bar for
performance troubleshooting
New Views
Intuitive and easy plan forcing

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Query Store schema explained

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Query Store Dashboard

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Q & A

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Andy Cross, Director of Elastacloud, Microsoft Regional Director, Azure MVP and all round good guy, gives a session on how to successfully build or transform a business using AI technologies. Over the last years, Elastacloud have delivered analytics projects to a variety of customers. The greatest challenges around AI are both technical and organisational. The existing landscape of process and strategy doesn't solve these challenges in combination, and the gap between causes friction and the failure of AI projects. When modelling the outcome of actions that were informed by AI, possibly enacted by AI, the standard risk modelling approaches need to be transformed to include a factor that can change over time to represent the effectiveness of the AI solutions. Given that we should accept errors as part of the AI solution, and that errors are reinforcing of better future decisions, we need to project risk as a decreasing vector over time.

ITCamp 2019 - Andy Cross - Business Outcomes from AI

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ITCamp

You may have heard me talk about the capabilities of Azure Logic Apps and Azure Functions before, but now I'm taking it up a few notches! And this is mostly because a lot of things have changed over the past few months in terms of serverless and cloud-native applications. Join me at this session during which you will get to do a deep dive with me on the ins and outs of Azure Functions when it comes to developer real applications, not just 'Hello, World's and the brand-new, top-notch Azure Service Fabric Mesh offering. I will finger point each bad practice and the things you should avoid, but at the end of the day we'll have created a highly scalable, production-ready application. So, how far and how fast can we actually go... now?

ITCamp 2019 - Alex Mang - How Far Can Serverless Actually Go Now

ITCamp

Marcus Vitruvius Pollio, commonly known as Vitruvius, was a Roman author, architect, civil engineer and military engineer during the 1st century BC. He is known for his multi-volume work entitled “De architectura” and his discussion of perfect proportion in architecture and the human body, which led, among others to the famous drawing by Leonardo da Vinci called the “Vitruvian Man”. Within the principles of “Vitruvian Quality”, we seek to find those perfect proportions and how to align all components of the business architecture in order to make them fit the human needs of the impacted stakeholders.

ITCamp 2019 - Peter Leeson - Vitruvian Quality

ITCamp

This session might look like a joke, and it partially is. On one hand it is a parody about how the most recent trends in industry can significantly increase the cost associated with launching an application (design, development, hosting & operations, etc). However, it is also a live demo of how you can incrementally evolve your application to take advantage of all the cool technologies out there without needing the actual a million dollars.

ITCamp 2018 - Ciprian Sorlea - Million Dollars Hello World Application

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What does it take to connect a Google Home to a .NET container running in the cloud? Surprisingly, not much! In this talk, we will use Dialogflow to setup a Google Home device to talk to a .NET container managed by Kubernetes Engine. We will take a look at some of the Google Cloud services such as Machine Learning APIs, BigQuery, Stackdriver diagnostics and see how they can elevate our Google Home to the next level. If you’re curious about what Google has to offer for your .NET apps, this talk is for you!

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ITCamp

Building and running a service for a truly global audience has always been the ultimate challenge for any business and for any application developer. In this session, we will discuss global perspectives on running your application tier in a scalable way – WebApps/APIs, Traffic Manager and Serverless. We will discuss the new Cosmos DB service offering in Azure and it’s built in global sync with little more than a press of a button on your end – data was always the final frontier of globalization of your app. We will look at what it takes to monitor this kind of an environment. Naturally this is a very big set of topics which means this session is aimed to give an overview, spark a discussion and provide some directional and inspirational input.

ITCamp 2018 - Magnus Mårtensson - Azure Global Application Perspectives

ITCamp

With the new model, Azure Resource Manger Microsoft are gaining the repeatability they always wanted to have for deployment to the Cloud and removing the dreary, repetitive, error prone manual deployment tasks which has always held us back! With ARM, you can create a Template for your environment and use that for deploying identical environments every time without fail! There is some news in the world of “infrastructure as code” that we need to consider while setting up our Cloud environments. The Win we get from being able to deploy our development environment or our temporary load test environment automatically and identically to our production environment cannot be understated. This is ARM from a project efficiency, development and DevOps perspective. This is what you need to know to make you much more efficient every day of development.

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With Fall Creators update for Windows 10, Microsoft provided the foundation for everyone to get accustomed with the Mixed Reality concept and try to create and consume VR at home. Along with the recent lunch of several headset by Microsoft’s OEM partners, Mixed Reality is closer than ever before. Through this presentation I will walk through the basic concepts, hardware, tools and API’s you’ll need to start building your Windows Mixed Reality experience. At the end of the presentation, you will be ready to create your first Mixer Reality app for Microsoft’s HoloLens and other Windows Mixed Reality devices, in a matter of minutes. With the recent release of the Microsoft Mixed Reality headsets, controllers and Fall Creators update for Windows 10, it has never been a better time to immerse yourself in to the Mixed Reality space.

ITCamp 2018 - Ionut Balan - A beginner’s guide to Windows Mixed Reality

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Badly designed code is one of the highest price we pay as an industry. In many cases the cost of adding or changing features increases with the time we advance into the project. The bigger the project gets, the more complex it gets and the more costly it is to work on it, if it lacks structure. If you need to migrate it, you need to rewrite it all. In this session I will show from real world projects experience how to keep your team efficient changing the code when you need to move into the Cloud, with what I call the Application Software Infrastructure. It assures code quality through structure rather than relying on discipline only. It documents the architecture into code and bridges this way the architectural diagrams and the code structures.

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Webinar Recording: https://www.panagenda.com/webinars/why-teams-call-analytics-is-critical-to-your-entire-business Nothing is as frustrating and noticeable as being in an important call and being unable to see or hear the other person. Not surprising then, that issues with Teams calls are among the most common problems users call their helpdesk for. Having in depth insight into everything relevant going on at the user’s device, local network, ISP and Microsoft itself during the call is crucial for good Microsoft Teams Call quality support. To ensure a quick and adequate solution and to ensure your users get the most out of their Microsoft 365. But did you know that ‘bad calls’ are also an excellent indicator of other problems arising? Precisely because it is so noticeable!? Like the canary in the mine, bad calls can be early indicators of problems. Problems that might otherwise not have been noticed for a while but can have a big impact on productivity and satisfaction. Join this session by Christoph Adler to learn how true Microsoft Teams call quality analytics helped other organizations troubleshoot bad calls and identify and fix problems that impacted Teams calls or the use of Microsoft365 in general. See what it can do to keep your users happy and productive! In this session we will cover - Why CQD data alone is not enough to troubleshoot call problems - The importance of attributing call problems to the right call participant - What call quality analytics can do to help you quickly find, fix-, and prevent problems - Why having retrospective detailed insights matters - Real life examples of how others have used Microsoft Teams call quality monitoring to problem shoot problems with their ISP, network, device health and more.

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EMPOWERMENT TECHNOLOGY GRADE 11 QUARTER 2 REVIEWER

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In the thrilling conclusion to 2023, ransomware groups had a banner year, really outdoing themselves in the "make everyone's life miserable" department. LockBit 3.0 took gold in the hacking olympics, followed by the plucky upstarts Clop and ALPHV/BlackCat. Apparently, 48% of organizations were feeling left out and decided to get in on the cyber attack action. Business services won the "most likely to get digitally mugged" award, with education and retail nipping at their heels. Hackers expanded their repertoire beyond boring old encryption to the much more exciting world of extortion. The US, UK and Canada took top honors in the "countries most likely to pay up" category. Bitcoins were the currency of choice for discerning hackers, because who doesn't love untraceable money?

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Following the popularity of "Cloud Revolution: Exploring the New Wave of Serverless Spatial Data," we're thrilled to announce this much-anticipated encore webinar. In this sequel, we'll dive deeper into the Cloud-Native realm by uncovering practical applications and FME support for these new formats, including COGs, COPC, FlatGeoBuf, GeoParquet, STAC, and ZARR. Building on the foundation laid by industry leaders Michelle Roby of Radiant Earth and Chris Holmes of Planet in the first webinar, this second part offers an in-depth look at the real-world application and behind-the-scenes dynamics of these cutting-edge formats. We will spotlight specific use-cases and workflows, showcasing their efficiency and relevance in practical scenarios. Discover the vast possibilities each format holds, highlighted through detailed discussions and demonstrations. Our expert speakers will dissect the key aspects and provide critical takeaways for effective use, ensuring attendees leave with a thorough understanding of how to apply these formats in their own projects. Elevate your understanding of how FME supports these cutting-edge technologies, enhancing your ability to manage, share, and analyze spatial data. Whether you're building on knowledge from our initial session or are new to the serverless spatial data landscape, this webinar is your gateway to mastering cloud-native formats in your workflows.

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Following the popularity of “Cloud Revolution: Exploring the New Wave of Serverless Spatial Data,” we’re thrilled to announce this much-anticipated encore webinar. In this sequel, we’ll dive deeper into the Cloud-Native realm by uncovering practical applications and FME support for these new formats, including COGs, COPC, FlatGeoBuf, GeoParquet, STAC, and ZARR. Building on the foundation laid by industry leaders Michelle Roby of Radiant Earth and Chris Holmes of Planet in the first webinar, this second part offers an in-depth look at the real-world application and behind-the-scenes dynamics of these cutting-edge formats. We will spotlight specific use-cases and workflows, showcasing their efficiency and relevance in practical scenarios. Discover the vast possibilities each format holds, highlighted through detailed discussions and demonstrations. Our expert speakers will dissect the key aspects and provide critical takeaways for effective use, ensuring attendees leave with a thorough understanding of how to apply these formats in their own projects. Elevate your understanding of how FME supports these cutting-edge technologies, enhancing your ability to manage, share, and analyze spatial data. Whether you’re building on knowledge from our initial session or are new to the serverless spatial data landscape, this webinar is your gateway to mastering cloud-native formats in your workflows.

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Keynote 2: APIs in 2030: The Risk of Technological Sleepwalk Paolo Malinverno, Growth Advisor - The Business of Technology Apidays New York 2024: The API Economy in the AI Era (April 30 & May 1, 2024) ------ Check out our conferences at https://www.apidays.global/ Do you want to sponsor or talk at one of our conferences? https://apidays.typeform.com/to/ILJeAaV8 Learn more on APIscene, the global media made by the community for the community: https://www.apiscene.io Explore the API ecosystem with the API Landscape: https://apilandscape.apiscene.io/

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Tracing the root cause of a performance issue requires a lot of patience, experience, and focus. It’s so hard that we sometimes attempt to guess by trying out tentative fixes, but that usually results in frustration, messy code, and a considerable waste of time and money. This talk explains how to correctly zoom in on a performance bottleneck using three levels of profiling: distributed tracing, metrics, and method profiling. After we learn to read the JVM profiler output as a flame graph, we explore a series of bottlenecks typical for backend systems, like connection/thread pool starvation, invisible aspects, blocking code, hot CPU methods, lock contention, and Virtual Thread pinning, and we learn to trace them even if they occur in library code you are not familiar with. Attend this talk and prepare for the performance issues that will eventually hit any successful system. About authorWith two decades of experience, Victor is a Java Champion working as a trainer for top companies in Europe. Five thousands developers in 120 companies attended his workshops, so he gets to debate every week the challenges that various projects struggle with. In return, Victor summarizes key points from these workshops in conference talks and online meetups for the European Software Crafters, the world’s largest developer community around architecture, refactoring, and testing. Discover how Victor can help you on victorrentea.ro : company training catalog, consultancy and YouTube playlists.

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Angeliki Cooney has spent over twenty years at the forefront of the life sciences industry, working out of Wynantskill, NY. She is highly regarded for her dedication to advancing the development and accessibility of innovative treatments for chronic diseases, rare disorders, and cancer. Her professional journey has centered on strategic consulting for biopharmaceutical companies, facilitating digital transformation, enhancing omnichannel engagement, and refining strategic commercial practices. Angeliki's innovative contributions include pioneering several software-as-a-service (SaaS) products for the life sciences sector, earning her three patents. As the Senior Vice President of Life Sciences at Avenga, Angeliki orchestrated the firm's strategic entry into the U.S. market. Avenga, a renowned digital engineering and consulting firm, partners with significant entities in the pharmaceutical and biotechnology fields. Her leadership was instrumental in expanding Avenga's client base and establishing its presence in the competitive U.S. market.

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The value of a flexible API Management solution for Open Banking Steve Melan, Manager for IT Innovation and Architecture - State's and Saving's Bank of Luxembourg Apidays New York 2024: The API Economy in the AI Era (April 30 & May 1, 2024) ------ Check out our conferences at https://www.apidays.global/ Do you want to sponsor or talk at one of our conferences? https://apidays.typeform.com/to/ILJeAaV8 Learn more on APIscene, the global media made by the community for the community: https://www.apiscene.io Explore the API ecosystem with the API Landscape: https://apilandscape.apiscene.io/

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Corporate and higher education. Two industries that, in the past, have had a clear divide with very little crossover. The difference in goals, learning styles and objectives paved the way for differing learning technologies platforms to evolve. Now, those stark lines are blurring as both sides are discovering they have content that’s relevant to the other. Join Tammy Rutherford as she walks through the pros and cons of corporate and higher ed collaborating. And the challenges of these different technology platforms working together for a brighter future.

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MS Copilot expands with MS Graph connectors

Nanddeep Nachan

Three things you will take away from the session: • How to run an effective tenant-to-tenant migration • Best practices for before, during, and after migration • Tips for using migration as a springboard to prepare for Copilot in Microsoft 365 Main ideas: Migration Overview: The presentation covers the current reality of cross-tenant migrations, the triggers, phases, best practices, and benefits of a successful tenant migration Considerations: When considering a migration, it is important to consider the migration scope, performance, customization, flexibility, user-friendly interface, automation, monitoring, support, training, scalability, data integrity, data security, cost, and licensing structure Next Wave: The next wave of change includes the launch of Copilot, which requires businesses to be prepared for upcoming changes related to Copilot and the cloud, and to consolidate data and tighten governance ShareGate: ShareGate can help with pre-migration analysis, configurable migration tool, and automated, end-user driven collaborative governance

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Execution Plans in practice - how to make SQL Server queries faster - Damian Widera

1. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Execution plans in practice – how to make SQL Server queries faster Damian Widera Microsoft Data Platform MVP EUVIC @damianwidera http://sqlblog.com/blogs/damian_widera/default.aspx

2. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Many thanks to our sponsors & partners! GOLD SILVER PARTNERS PLATINUM POWERED BY

3. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Come to Poland on October 1st!

4. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Damian Widera

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6. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Customers…

7. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals • What is bad in terms of query execution • What was bad in previous examples is not always bad… • SQL Server 2016 – how could it help? Today I am going to tell about….

8. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals SQL Server School of Art

9. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals • A query takes long time to execute • A query consumes too much resources • Then we have: –Reduced concurency –More locks that should be • Locks contentions, waits, etc… What is bad in terms of query execution

10. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals • A query (logical) is parsed and optimized based on all available information (cost optimization) • Estimation != Guestimation • Plan(s) is (are) produced How it works

11. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Bad row estimates can impact a variety of decisions including: • index selection seek vs. scan operations, • parallel versus serial execution, • join algorithm selection, • inner vs. outer physical join selection (e.g. build vs. probe), • spool generation, • bookmark lookups vs. full clustered or heap table access, • stream or hash aggregate selection Why it is so important?

12. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals • Index or table scans (*): May indicate a need for better or additional indexes (*) – THIS IS NOT ALWAYS WRONG!!!! • Bookmark Lookups: Consider changing the current clustered index, consider using a covering index, limit the number of columns in the SELECT statement. • Filter: Remove any functions in the WHERE clause, don’t include views in your Transact-SQL code, may need additional indexes. What to look for…

13. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals • Sort: Does the data really need to be sorted? Can an index be used to avoid sorting? Can sorting be done at the client more efficiently? „Hidden” sort. Nonlinear operation • Spool. Used as a cache in the QP. Reason – lack of indexes or uniqueness. Implemented as a hidden tables in tempdb • Hash. Used for joins and aggregations. Builds a hashtable in memory (or in tempdb). Means there is no good index. What to look for…

14. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals

15. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals • When index scan is the best option –Two examples • High density -> Seek • Low density -> Scan • When cursor can be the best option (especially for SQL Server 2008 R2 and older) –Running total What was bad in previous example is not always bad…

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17. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals New functionality that makes DBAs’ happy - Query Store will be available in all editions SQL Server 2016 – how could it help?

18. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Query data store Durability latency controlled by DB option DATA_FLUSH_INTERNAL_SECONDS Compile Execute Plan store Runtime stats Query Store schema Collects query texts (plus all relevant properties) Stores all plan choices and performance metrics Works across restarts / upgrades / recompiles Dramatically lowers the bar for performance troubleshooting New Views Intuitive and easy plan forcing

19. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Query Store schema explained

20. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Query Store Dashboard

21. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals

22. @ITCAMPRO #ITCAMP16Community Conference for IT Professionals Q & A

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