Must be Dell DBA Days:
Join us live as we performance tune – and break – SQL Servers:
- Thursday Morning: Finding Your Slow SQL Server’s Bottlenecks in Record Time with Wait Stats
- Thursday Afternoon: How to Prove Hardware is the Problem
- Friday Morning: SQL Server High Availability, Disaster Recovery, and Licensing Explained
- Friday Afternoon: Watch SQL Server Break and Explode
This is our first effort to release SQL Server Management Studio (SSMS) in a mechanism outside of the SQL Engine releases. Our goal is to update this frequently with new features, fixes and support for the newest SQL Server features in SQL Server Engine and Azure SQL Database.
Awww yeah! Lightweight installer, and here’s the best part: there’s a built-in check for updates.
That’s right: Microsoft might start shipping updates to SSMS outside of the regular SQL Server Service Pack scenario!
This telegraphs a couple of interesting things: first, they had to do it because Azure SQL Database ships updates much faster than SQL Server does, so this gives Microsoft a way to enable those updates in SSMS without releasing a separate service pack.
But more interestingly – to me at least – is that this means SQL Server Management Studio is now considered The Way to Manage Azure SQL Database. There isn’t a separate tool coming, nor will designer/developer tools like Visual Studio become a management tool.
SSMS is finally getting some much-needed love. Rejoice, dear readers.
If you want to work on the cutting edge, you can’t just read best practices – you have to go create them. Somebody’s gotta teach you how to use SQL Server 2016, right?
We asked Dell if we could fly out to their headquarters in Round Rock, Texas and borrow a bunch of hardware and storage gear for a week. Doug, Erik, Jeremiah, Kendra, and I will set up shop to do lab tests, experiments, and learning with the latest hardware, shared storage gear, and SQL Server 2016.
And we bet you wanna watch online.
So we’re bringing you Dell DBA Days. Twice a day, we’ll take a break from our work to do a one-hour webcast with you, talking about how we’re testing and what we’re learning.
Here’s the webcast lineup:
- Tuesday morning – How Do You Fix a Slow TempDB?
- Tuesday afternoon – TempDB Load Testing with SQL 2012, 2014, 2016, and SSDs
- Wednesday morning – Introducing This Week’s Lab
- Wednesday afternoon – Advanced Shared Storage Features
- Thursday morning – Find Your Slow SQL Server’s Bottlenecks Fast
- Thursday afternoon – How to Prove Hardware is a Problem
- Friday morning – SQL Server High Availability Options Explained
- Friday afternoon – Watch SQL Server Break and Explode
When your SQL Server is slow right now, you can run sp_AskBrent® to find out what’s going on. It checks for things like long-running queries, backups, blocking, files growing, and will tell you the top wait stats right now.
You can use the @Seconds parameter to control the sample length – by default, it samples for 5 seconds.
In the newest version, you can use @Seconds = 0 to skip the sampling altogether, and turn on @ExpertMode = 1 to see all the dirty details:
The top result set is about urgent warnings, and you can skip those if you’re doing over-time analysis. The wait stats and physical reads/writes are useful, though – these show you the top files by reads and writes for your instance.
Also in the news, when you fill out our EULA to download it (along with all of our goodies), there’s a checkbox to get alerted whenever we update our First Responder Kit. If you check that, we now send you a direct link to the zip file so you don’t have to hassle with the EULA again.
Enjoy, and hope this helps make your life easier.
Brent & Jeremiah are coming to Pittsburgh on October 2-3, 2015. We’re doing a one-day pre-con, and then sticking around to present at SQLSaturday Pittsburgh too.
Developer’s Guide to SQL Server Performance – Live!
You’re stuck with a database server that’s not going fast enough. You’ve got a hunch that the biggest bottleneck is inside the database server somewhere, but where? In this one-day class, you’ll learn how to use powerful scripts to identify which queries are killing your server, what parts of the database server are holding you back, how to tackle indexing improvements, and how to identify query anti-patterns.
In one day of training with Brent Ozar and Jeremiah Peschka, you’ll learn:
- How wait stats tell you where to focus your tuning
- How the plan cache shows you which queries are the worst
- How to make fast improvements by picking the right indexes
- How to identify and fix the most common query anti-patterns
This is a pre-con before SQLSaturday Pittsburgh. If you haven’t attended a pre-con before, there’s a few things to be aware of. The session will be held at:
Pittsburgh Technical Institute
111 McKee Road
Oakdale, PA 15071
Lunch is included with your admission, but it will not include hands-on lab exercises or copies of the slides. This is how we keep SQLSaturday pre-con costs low – these SQLSaturday pre-cons are the most cost-effective way to get a day of training from us.
You want your SQL Server VM to go as fast as possible, but you don’t have a lot of time or budget money, and you’re not allowed to reinstall it or upgrade. Good news – we’ve got a webcast for you.
In part 1, my demo-focused session will explain the VM-friendly performance features of SQL Server 2012, 2014, and even the next version, 2016.
You’ll learn how to measure a running application’s performance, and then simply by turning a few knobs and switches, you’ll see how performance improves. Microsoft Certified Master Brent Ozar will explain which features are right for your workloads, plus give you resources you can use when you get back to the office to go faster and learn more.
In part 2, Veeam will explain how to get fast transaction-level recovery of SQL databases, including agentless transaction log backup and replay, so you can restore your SQL databases to a precise point in time and achieve low recovery time and point objectives (RTPO™). Learn more at Veeam Explorers™.
This session is for sysadmins and DBAs running production workloads in VMware, Hyper-V, and Xen, whose end users are unhappy with performance.
Yesterday, Microsoft announced availability of Service Pack 1, saying:
As part of our continued commitment to software excellence for our customers, this upgrade is available to all customers with existing SQL Server 2014 deployments via the download links below.
Yeah, about that commitment to software excellence.
This morning, the download is gone:
Notice: The SQL SSIS team has found an issue with SP1 installation if SSIS catalog is present in the SQL Server instance.They are currently investigating this issue including possible workarounds and fixes.
Oof – the term “possible workarounds and fixes” doesn’t sound good for those who jumped in and applied the patch. A commenter on the MS Data Platform Insider blog reported that it
hosed the master database broke the instance in a way suspiciously similar to a similar bug in SQL Server 2012 SP2.
(And jeez, what is it with service packs lately? Remember the SQL 2012 SP1 100% CPU issue? I’m starting to think you’re safer with cumulative updates than with service packs.)
Remember, kids, don’t rush into patching. If your servers are mission critical, test in your staging environment first – staging is the DBA’s development. (No, your development environment isn’t staging – because your developers make their living in the dev environment, and if you broke that with SP1 yesterday, you’ll be slaving away today to get your dev instance back up and running.)
Update: the fix is in. If you applied SP1, follow the instructions in this StackExchange post.
Ever wonder how somebody else does it? Watch over my shoulder for this beautifully recorded one-hour session at SQLRally Nordic in Copenhagen from a couple weeks ago:
The resources, scripts, and my Be Creepy process are all free too. Enjoy, and check out all of the session recordings for even more free learnin’.
Sometimes we pile just a few too many duties onto our servers. They start to become a clown car – the classic joke where dozens of clowns come pouring out of an impossibly small car. (The physics behind it are actually really interesting.)
So how can you tell if your SQL Server has crossed the line into clown car territory? It’s easy:
10. You have both production and development databases in it.
9. Everyone runs SSMS and Visual Studio by remote desktopping into the server.
8. You’ve enabled remote desktop services for more people to log in simultaneously.
7. It has the engine, SSRS, SSAS, SSIS all installed and running, but less than 32GB RAM.
6. It has multiple instances of each of those services running. (Bonus points for different versions.)
5. Application servers point to a file share hosted by this database server.
4. You’re monitoring it, and the monitoring software’s repository also lives on the same server you’re monitoring.
3. You built a spreadsheet to track your affinity masking, Resource Governor, and max memory settings.
2. When you say “the server,” you don’t have to clarify because everyone knows it’s your only one.
1. You’re reading this blog on the server right now.
Kendra says: If you care about performance, you’ve got to start pulling clowns out of that tiny car.
When I ask you how fast your car is, there’s a two common metrics for answers:
- How fast it can go
- How much horsepower or torque its engine can deliver
If I ask you how hard your car is working right now, you’d probably answer with:
- Its current speed (in MPH or KPH)
- Its current engine workload (in RPM)
Conveniently, these two numbers are shown front and center on most car dashboards:
For SQL Server, those numbers are:
Current speed: Batch Requests per Second – the number of queries your server is currently handling. It’s available via Perfmon counter, and it’s on the dashboard of most monitoring software.
Wait Time per Core per Second – wait stats is the technique of measuring how much SQL Server is waiting on. You can’t tune wait stats using percentages – instead, you have to look at the total amount of time involved.
Compare these two five-second moments in the life of a SQL Server:
It’s clear that in Workload A, nothing is going on. Sure, 100% of our waits are on storage, but we don’t really have a storage problem. If Workload A was a car, it would be rolling along at 1mph, waiting for the driver to hit the gas pedal.
In workload B, there’s much more going on – but do we have a performance problem yet? That’s not quite as clear. To get the real picture, I have to tell you how many cores the server has.
Let’s Use Wait Time Per Core Per Second
Waits over time don’t really give you a clear picture – you have to divide the workload by the number of cores you have. Let’s say they’re both running on a VM with 8 virtual cores:
The VM on the left isn’t doing any work. It’s coasting.
On the VM on the right, for every second on the clock, each of its cores is spending .4 seconds (400 milliseconds) waiting on something (disk, memory, locks, etc.) While that might sound significant at first, it’s still really not doing any hard work. It’s not unusual for each core to spend several seconds per second waiting on different resources – and that’s fine, because SQL Server’s schedulers are good at switching over and running other queries that don’t need to wait.
For example, say you fire off a big SELECT query that scans a huge table, and we have to go get a lot of data from disk to accomplish it. That query’s tasks can wait for dozens (or hundreds or thousands) of milliseconds while other queries get their work done.
That’s why to measure SQL Server workloads, I’m proposing a new metric: Wait Time per Core per Second. That one metric, by itself, is a lot like the tachometer on a car’s dashboard. It’s not a measurement of how powerful your car is, but it does tell you how hard your car is working at this moment in time.
sp_AskBrent® now gives you this metric.
We’ve added new key metrics to the default output, including Batch Requests per Second, and Wait Time per Core per Second:
Note the new output down around priority 250-251 – it helps you get a fast idea of whether the SQL Server is working hard right now, or hardly working.
You can download our First Responder Kit with sp_AskBrent® now, and in our training classes, I show you more details on how I use it to triage real-world performance emergencies.