Sometimes, while working on something as foundational as SQL Server Central, (which is a temporary responsibility for Grant, John and I while Steve is on sabbatical) I catch myself falling into an old, familiar loop double-checking my choices, second-guessing even the most minor decisions, as is the norm for anyone who’s a database administrator (or […]
This article dives deep into cxpacket and cxconsumer in sql server, explaining how to simulate each, when they appear, and why they matter. Using live execution plans, wait monitoring, and worker thread diagnostics, we uncover how uneven parallelism triggers thread sync waits—and how SQL Server sometimes hides real issues behind innocent-looking CXCONSUMER waits. Includes step-by-step queries, tuning tips, and a real-world scenario where repartition streams quietly ruined performance.
About two decades ago, I introduced the concept of transition constraints to show Data Validation in a database is a lot more complex than seeing if a string parameter really is an integer. In October of 2008, I did an article called Constraint Yourself! on how to use DDL constraints to assure data integrity. One of the topics in that piece was a look at state transition constraints via an auxiliary table.
In the US, this is the Independence Day weekend. I had a few spare vacation days, so I tacked one on, making this a four day weekend. My plans are simple. Prep for my family coming over on the 5th for a celebration of the 4th (Ha!). Work on my query tuning book (gotta make […]
Learn about a free inventory tool to help you keep track of basic information on your servers.
Hello, Grant again as Steve is on sabbatical. My evenings and weekends are currently being used to update my SQL Server query performance book for 2025. I really enjoy it because writing the book forces me to structure my learning on SQL Server 2025, not just hit it in some slipshod manner. Plus, I've got […]
Building pipelines in Microsoft Fabric can be complicated, and it's easy to write code that is hard to maintain. Using parameters in your connections helps to build pipelines that are easily configured.
When I was perusing my LinkedIn feed the other day, I came across this thread about using SELECT *. In one of the replies, Aaron Cutshall noted that: “Another real performance killer is SELECT DISTINCT especially when combined with UNION. I have a whole list of commonly used hidden performance killers!”
Hey all! It's me, Grant. For those who don't me, Grant Fritchey. I work with Steve Jones, the person normally talking to you here. Yes, Redgate actually employs me, and continues to. I don't know why either. Anyway, Steve is off for a few weeks on his sabbatical. More power to him and I hope […]
In this next level of the Stairway to Snowflake, we delve into Event Tables. These are used to capture telemetry from your Snowflake database.
Setting page visibility and the active page are often overlooked last steps when publishing...
By Steve Jones
It’s time for T-SQL Tuesday again and this time Todd Kleinhans has a great...
By Steve Jones
Recently I was working in VS Code and I saw a walkthrough for the...
Comments posted to this topic are about the item Password Guidance
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I am trying to check out elastic query between two test instances we have...
What happens if you run the following code in SQL Server 2022+?
declare @t1 table (id int); insert into @t1 (id) values (NULL), (1), (2), (3); select count(*) from @t1 where @t1.id is distinct from NULL;See possible answers