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[Video] Office Hours 2017/12/6 (With Transcriptions)
This week Brent, Erik, and Richie discuss filestream waits, what to use instead of filestream, Availability Groups & clusters, implicit data conversion, using snapshot backups, MERGE statement...
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Tell Us What You Make: The 2018 Data Professional Salary Survey
Not what you’re worth, dear reader: we know your worth cannot possibly be calculated in base-10 numbering systems because you’re just so awesome, but what you make. How many stacks of Paul Whites are...
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What Your SQL Server Is Really Waiting On: YOU
Land of Confusion Most SQL Servers out there have never had anyone do a thorough, targeted assessment on them, the way we do our Critical Cares. This leads to a lot of astray troubleshooting, which may...
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Query Plan Oddities: Two Identical Missing Indexes
As I’ve been building labs for my Mastering Query Tuning class, I’ve been spelunking through data.stackexchange.com. It’s where anybody can write queries against the Stack Overflow databases, and share...
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Can you prevent deletes and inserts without a WHERE clause from running?
File this under bad idea thong In the tradition of Klaus Aschenbrenner wanting to prevent people from writing SELECT * queries, I thought it might be nice to prevent people from running deletes or...
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Database History: The Inventor of the Data Page
Do you ever wonder about the history of the systems you rely on every day? They didn’t teach us database history in school. Instead, we got calculus and art and interpretive dance. Fat lot of good that...
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[Video] Office Hours 2017/12/13 (With Transcriptions)
This week Tara, Erik, and Richie discuss virtualization, replication & mirroring, switching SQL service logins to an AD account, temporal tables, tempdb issues, migrating from SQL 2015, and...
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GDPR: Why We Stopped Selling Stuff to Europe
The EU’s new General Data Protection Regulation (GDPR) is a set of rules that give consumers rights about how their data is stored, used, and deleted. This step-by-step GDPR guide for managers is a...
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Rebuilding Indexes Can Slow Queries Down
Today, Jonathan Kehayias wrote about how fragmentation impacts execution plans. I’m really into performance tuning, so I read the post carefully, really interested to see how it impacted query runtime....
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Introducing sp_BlitzLock: For Troubleshooting SQL Server Deadlocks
Deadlocks are hard Especially when there are a lot of them. When there are dozens or more, looking at each graph is a pain. I had a script written that parsed out the XML, but really, having a folder...
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Maintenance Plans Enable Your Disabled Indexes
One of Brent’s students in the Performance Tuning class, Jason M., told Brent that maintenance plans enable your disabled indexes. What the what? Steps to reproduce: Disable an index Setup a...
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Do Disabled Indexes Affect Missing Index Recommendations?
I’m so glad you asked! Let’s take a look. Open up the Stack Overflow database, turn on actual execution plans, and run a query that will cause SQL Server to beg and plead for an index:SELECT * FROM...
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Sizing A New Server? Start With Maintenance.
Clientele Most of out customers are on slightly (ahem) older (AHEM) hardware, and they have big questions: How do we know what kind of hardware we need? How do we load test it? How do we know what to...
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[Video] Office Hours 2017/12/20 (With Transcriptions)
This week Brent, Erik, and Richie discuss truncating & repopulating, failed logins, their choice for high availability, PowerBI, read committed isolation, parameter sniffing, database mirroring,...
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Female DBAs Make Less Money. Why?
The 2018 Data Professional Salary Survey is open now, and you can look at the live responses as they come in. (To get that in Excel, click File, Download.) As of this writing (Dec 23), there’s already...
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Our 25 Most-Read and Most-Commented Blog Posts of 2017
We published a whopping 312 blog posts in 2017! Looking back, wow, there was a lot of fun stuff in here. First, here’s the ones you read the most: 25. Max Worker Threads – Don’t Touch That 24....
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How Personally Identifiable Information Gets Around
Let’s say someone – not you, dear reader, because you would surely never be this sloppy – is building a personal web site or a diary or a company or whatever:CREATE TABLE dbo.People (LastName...
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What’s So Bad About Shrinking Databases with DBCC SHRINKDATABASE?
You read a lot of advice that says you shouldn’t shrink databases, but…why? To demonstrate, I’m going to: Create a database Create a ~1GB table with 5M rows in it Put a clustered index on it, and check...
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Heaps, Deletes, and Optimistic Isolation Levels
The Humble Heap If you don’t know this by now, I’m going to shovel it at you: If you have a table with no clustered index (a Heap), and you delete rows from it, the resulting empty pages may not be...
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Network Issue or THREADPOOL waits?
I’ve had a handful of clients that were experiencing significant THREADPOOL waits. This isn’t a wait type that I had any knowledge of prior to joining Brent Ozar Unlimited. Looking back, I am pretty...
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