SQLServerFast

Execution Plans in Azure Data Studio

Hugo Kornelis
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Microsoft has two main tools for querying and managing SQL Server databases in a graphical UI. SQL Server Management Studio (SSMS) is for many people still the default choice; it used to be included with a SQL Server installation, it is the most familiar tool for most SQL Server professionals, it gives easy access to (almost) all SQL Server features, and it’s simply the interface we have been used to for as long as we’ve been working with SQL Server. The alternative is Azure Data Studio (ADS). This tool seems to be mostly targeted towards developers. A DBA will notice…
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Breaking the silence

Hugo Kornelis
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I’ve been slacking. I know. I have not published any new pages to the Execution Plan Reference since September. The last release of new content for the Execution Plan Video Training is even longer back, that was in May. No other blog posts, except from a few promotional posts. And until last Monday, nothing added to my YouTube channel either. Okay, I did still speak at various conferences. I answered the odd question at the #sqlhelp Twitter channel. I think I responded to all mails I received (but if not … my apologies and feel free to re-send!). So you…
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Here’s the execution plan … now what?

Hugo Kornelis
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I was really surprised, but also honoured, when I was asked to participate in the Query Tuning Learning Pathway at the 2021 PASS Community Summit. I immediately knew I wanted this to be a new session, and I wanted it to be special. After a few mails between Allen White (the pathway coordinator) and me, the idea was born to build a session aimed at bridging the gap between on the one side the simplified classroom examples typically used to explain a concept, and on the other side the big and messy execution plans you’ll encounter when trying to apply…
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Black Friday sale

Hugo Kornelis
2 Comments
“If Brent does it, it has to be smart, right? Right?” As a European, I have always struggled with the concept of Black Friday sale. For many reasons. It’s called Black Friday. Why does the sale for many retailers actually last a full week, or even a month? The discounts offered during the Black Friday sale are, often, huge. Why would anyone still buy any non-perishables at any other time of the year? But as a European, I also see the popularity of Black Friday sales increasing, in my own country and many other countries throughout the world. As well…
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Recorded conference sessions

Hugo Kornelis
2 Comments
Since the start of the Covid-19 pandemic, conferences have switched to a virtual format. During the pandemic that had only benefits, since the alternative would be no conference at all. Now that some areas of the world are slowly opening up again and the first few organizers tentatively prepare for live conferences, it will be interesting to see whether we’ll return to in-person delivery only, or whether we’ll see a mixture of in-person events, virtual events, and hybrid events going forward. Session recordings An interesting side effect of the rise of virtual events is that far more sessions than before…
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Plansplaining, part 19. Temporal tables (part 4)

Hugo Kornelis
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Welcome to part nineteen of the plansplaining series, where I will finally wrap up the discussion on temporal tables. In the first three parts, we looked at execution plans for modifying data in a temporal table, and for basic and advanced temporal queries. In this last part, we’ll shift away for execution plans (so the plansplaining tag is perhaps a bit misleading) and look at what happens if you join data from multiple temporal tables. Sample data I once more use the same tables as in all previous post, but this time I want a bit more control over the…
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T-SQL Tuesday #139 – Execution plans in a hybrid world

Hugo Kornelis
3 Comments
Another month has passed. Another T-SQL Tuesday arrives, with a new host and a new subject. The host is no less than the amazingly awesome (his words, not mine!) Ben Weissman (b|t); his selected topic, based on the realization that the data world is hybrid and will remain so, is to share our experiences with our journey towards or on that hybrid world of on-prem, cloud, and edge. I don’t care … I’ll admit, my first response was to just sit this one out. I am extremely specialized in execution plans, as a tool for query performance tuning. When your…
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Free video on percentages in execution plans

Hugo Kornelis
1 Comment
A few weeks ago I made a rather embarrassing discovery. I realised I had forgotten to include one of the most basic teachings about execution plans in my video training course. The subject is too important to leave out. It is too broad to add to an existing video. So I decided to add a seventh chapter to the (free!!) basic level of block 1. When I write, present, talk, or record about execution plans, I focus on how operators interact with each other and how that results in the desired results. Understanding performance issues comes automatically once you know…
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Plansplaining, part 18. Temporal tables (part 3)

Hugo Kornelis
1 Comment
Welcome to part eighteen of the plansplaining series. Like the previous posts, this one too focuses on temporal tables and their effect on the execution plan. After looking at data modifications in temporal tables and at querying with a most basic temporal form of temporal query, let’s look at the more advanced variations for temporal querying. We’re still looking at getting data from a single query only in this post. We’ll look at joins in the next post. Sample tables For the code samples in this post, I keep building on the demo tables and sample data from the previous…
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Recorded session: Debugging without debugger

Hugo Kornelis
2 Comments
Yesterday I presented a session for the virtual conference SQLDay, organized by our friends from the Polish SQL Server User Group (PLSSUG). An amazing conference that has chosen to use an interesting platform to try to recreate the in-person conference feeling while still being Covid-safe from behind your screen. However, an experimental new platform does come with challenges. During my presentation, my shared screen froze. After spending a few minutes trying to fix the issue I finally had to leave the application completely, then restart it. After that, the rest of the session delivery went fine. But the interruptions and…
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Hugo Kornelis

Married, father of 2 children.

Awarded 13x MVP (2006-2016; 2019-now), in the areas SQL Server and Data Platform.

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