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SQL Server 2017

SQL Server 2017 Release Date: October 19, 2017?

Last Updated September 25, 2017

SQL Server 2017

Eagle-eyed @NikoNeugebauer (who you should definitely be following on Twitter) noticed something interesting in one of Lenovo’s recent TPC-H benchmark results. In the #TPCH document, the availability of the system with #SQLServer 2017 is listed for 19th of October 2017 🙂https://t.co/Y3VNQt9buZ — Niko Neugebauer (@NikoNeugebauer) July 18, 2017 The benchmark PDF shows: Possible SQL Server 2017 release…

Do SQL Server 2017’s Adaptive Joins Work with Cross Apply or Exists?

Last Updated May 19, 2017

Adaptive Joins, SQL Server 2017

I think I’ve mentioned that the most fun part of new features is testing them with old ideas to see how they react. It occurred to me that if Adaptive Joins didn’t work with APPLY, I might cry. So, here goes nothin’! Cross Simple Cross Apply…ies can use Adaptive Joins, though at first glance there’s…

How Scalar Functions Can Stop You From Getting Adaptive Joins

Last Updated May 1, 2021

Adaptive Joins, Execution Plans, SQL Server 2017

If you’re not aware of the performance problems scalar valued functions can (and often do) cause, well, uh… click here. We’ll talk in a few days. If you are, and you’re worried about them crapping on Adaptive Joins, follow along. The big question I had is if various uses of scalar valued functions would inhibit…

SQL Server 2017: Interleaved MSTVFs Vs Inline Table Valued Functions

Last Updated May 12, 2017

Adaptive Joins, Execution Plans, SQL Server 2017

But is it faster? Now, I know. There are very few “always” things out there in SQL Server. This is also true for functions. A lot of the time — I might even say most of the time, inline table valued functions are going to be faster that scalar and multi statement table valued functions.…

SQL Server 2017: Interleaved Execution for MSTVFs

Last Updated May 15, 2017

Execution Plans, SQL Server, SQL Server 2017

What I don’t want you to take away from this Is that I want you to start using Multi Statement Table Valued Functions all over the place. There are still problems with them. Backed by table variables Lots of hidden I/O cost Number of executions may surprise you One important current limitation (May-ish of 2017)…

Breaking: SQL Server 2016 SP1 CU2 Supports ENABLE_PARALLEL_PLAN_PREFERENCE Hint

Last Updated May 13, 2017

Execution Plans, SQL Server, SQL Server 2017

Hot Diggety! After reading an excellent tip by Dmitry Pilugin about the new hint for forcing a parallel plan in SQL Server 2017, I figured I’d test it out on SQL Server 2016’s latest CU to see if it had been back ported yet. Good news! It has. Obviously. That’s the title of the blog…

SQL Server 2017: Statistics Information Comes To Query Plans

Last Updated May 15, 2017

Execution Plans, SQL Server 2017, Statistics

Warm fuzzies I think this is how my mom would have felt if I went to college. You see, once you stop cargo culting around index fragmentation, and disk queue length, you start to realize which things are actually important to query performance. Things like statistics, and cardinality estimation. And, sure, having the right indexes…

Adaptive Joins And SARGability

Last Updated May 12, 2017

Adaptive Joins, SQL Server 2017

There’s a famous saying Non-SARGable predicates don’t get missing index requests. And that’s true! But can they also stifle my favorite thing to happen to SQL Server since, well, last week? You betcha!© One Sided I’m going to paste in some queries, each with something non-SARGable. There are two tables involved: Users and Posts. Only…

Adaptive Joins And Local Variables

Last Updated May 12, 2017

Adaptive Joins, SQL Server 2017

With new features I really love kicking the tires to see how they work with existing features, and if they fix existing performance troubleshooting scenarios. One issue that I see frequently is with local variables. I’m not going to get into Cardinality Estimator math here, we’re just going to look at Adaptive Join plan choice…

Anatomy Of An Adaptive Join

Last Updated May 12, 2017

Adaptive Joins, SQL Server 2017

I don’t like it unless it’s brand new When new features drop, not everyone has time to jump on top of them and start looking at stuff. That’s what consultants with nothing better to do are for. I’ve been excited about this feature since talking to The Honorable Joseph Q. Sack, Esq. about it at…

The 2017 Adaptive Join Optimization Eats Bad TSQL For Breakfast

Last Updated May 12, 2017

Adaptive Joins, SQL Server 2017

Cheeky If you thought that title sounded familiar, you sure were right. That’s called a classical reference. So here we are, three whole years later, and yet another improvement to the engine promises to fix performance issues forever and ever. While this isn’t exactly an entirely new cardinality estimator, it’s an entirely new branch in…

Look Ma, Adaptive Joins

Last Updated May 12, 2017

Execution Plans, SQL Server 2017

This probably won’t seem like a big deal soon But I just got the optimizer to pick an Adaptive Join! It took a few tries to figure out what would cause some guesswork to happen, but here it is. I hope Joe Sack has strong ribs. And here’s the tool tip info! Dynamic Duo This…

SQL Server 2017: query_store_wait_stats

Last Updated May 12, 2017

Query Store (QDS), SQL Server 2017, Wait Stats

The missing link Back when the Query Store first got announced, I was amazed. The amount of information it gathered and persisted between reboots was such a big improvement over the plan cache, plus being able to force plans was really cool. I was always surprised that wait stats weren’t a part of that, especially…

SQL Server 2017: Unpublished Gems

Last Updated May 12, 2017

SQL Server 2017

Sneaky, sneaky, sneaky Release notes never seem to tell the full story, do they? At some point, you have to take matters into your own hands and go hunting for, as Paul Harvey would say, “The Rest Of The Story”. So what did I find? New stuff! Brand. New. Stuff. For you. If you ever…

SQL Server 2017: Quick Rundown

Last Updated May 12, 2017

SQL Server 2017

ICYMI Playing with SSMS in the lab Microsoft released CTP 2 of SQL Server vNext (well, yesterday today, but who knows when this thing will hit?). There’s some great new stuff in the Engine in this release that I’m just crazy about getting to know better. Going through the Release Notes made me feel things…

Brent Ozar reading

SQL Server 2017 Release Date: May 31?

Last Updated May 12, 2017

SQL Server 2017

At the SQLbits conference in the UK, Victoria Holt sat in on a session about the State of the SQL Nation. She writes: “SQL Server vNext will be launched this year with the UK launch 31 May 2017.” Keep in mind that “launch” is a marketing term, very different from “release.” (Even “release” is tricky…

Guess the SQL Server 2017 Release Date Contest

Last Updated October 1, 2017

SQL Server 2017

They used to release doves, but that’s so John Woo We’ve been doing this a while now, and time to kick it off again. Leave one – and only one – comment here with your guess of the date. If you leave multiple comments, only the first/earliest one is going to count. “The date” is…

Hidden in SQL Server 2017 CTP v1.1: sys.dm_db_stats_histogram

Last Updated May 12, 2017

SQL Server 2017, Statistics

It’s Friday night, so I’m waiting for new CTP Releases As soon as I got the email, I started reading the release notes. Some interesting stuff, of course. Batch mode queries now support “memory grant feedback loops,” which learn from memory used during query execution and adjusts on subsequent query executions; this can allow more…