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Answering Questions For Fun And No Profit

I love answering questions about SQL My forum of choice is dba.stackexchange.com because I find the voting and point system with badges for being a decent internet person addictive. If you like more traditional forums, SQLServerCentral.com has a lot of really smart people on it as well. When I post questions or answers, I try…
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The Ghosts of Temp Tables Past

True story You may find it hard to believe, but I recently had to fix a small bug in sp_BlitzCache and sp_BlitzQueryStore. Since both stored procedures have similar functions, they also share some temp table names (mainly the ones for parsing down XML nodes to more manageable chunks). In the window where I was making…
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Brent Ozar attacked by bear

What If Week: What Would You Look At First?

For this week’s What If series, we’re exploring what would happen if you had access to SQL Server’s source code – like if you got a job at Microsoft, signed a partner NDA, if the code leaked, or if it went open source. Today’s question is, “What would you look at first?” Brent says: I’d…
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How to Drop All Your Indexes – Fast

Sometimes I need to reset stuff during performance training classes. I know some of you teach classes, too, and some of you just like doing crazy stuff. So here you go, a stored procedure to lose weight fast: DropIndexes for SQL Server 2016 & Newer Transact-SQL CREATE OR ALTER PROCEDURE [dbo].[DropIndexes] @SchemaName NVARCHAR(255) = 'dbo',…
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Live Blogging: Erik vs. PowerShell

Oh, hey, happy Saturday First, I’d like to apologize to Conor Cunningham for the blatant theft of a blog title. That’s what you get for not posting in three years (like the desert miss the rain~). Why am I here? Why am I writing PowerShell, my sworn enemy? I do it for you. I’m trying…
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There’s Something Funny About Variable Assignment

Guess who I’m going to give you three queries, and you have to guess what the output will be before you run them. Here they are: Transact-SQL DECLARE @DatabaseName NVARCHAR(256) = N'' SELECT @DatabaseName = d.name FROM sys.databases d WHERE d.name = 'master' AND compatibility_level = 130 ORDER BY d.database_id PRINT @DatabaseName SELECT @DatabaseName =…
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Bad Idea Jeans Week: Building a Fork Bomb in SQL Server

Somewhat different than a sex bomb, a fork bomb is a denial-of-service attack that just starts a process that replicates itself, thereby starting more and more processes until the service goes down. Wikipedia’s fork bomb page lists examples on most operating systems (including Windows). I’ve always found fork bombs funny because of their elegant simplicity, so…
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