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Unmasking CXPACKET and CXCONSUMER in SQL Server: What Your Execution Plan Isn’t Telling You

  • Article

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.

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2025-07-07

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External Article

State Transition Constraints

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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.

2025-07-07

SQLServerCentral Editorial

The Long Weekend

  • Editorial

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 […]

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2025-07-05

82 reads

SQLServerCentral Editorial

Own Your Mistakes

  • Editorial

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 […]

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2025-07-04

87 reads

SQLServerCentral Editorial

Filling Big Shoes

  • Editorial

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 […]

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2025-07-02

113 reads

SQLServerCentral Article

The Hidden Cost of MAXDOP: CPU Spikes, Query Slowdowns, and What We Learned

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Misusing MAXDOP can silently kill performance across your SQL Server. In this deep dive, we uncover how one bad query caused CPU meltdown, run real-world tests, and show how tuning—not parallelism—often holds the true fix.

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2025-06-23

4,508 reads

SQLServerCentral Editorial

Shades and Reflecting on SQLBits and the Bright Future of Data

  • Editorial

There is something magical about SQLBits. Whether it is the technical sessions, the sense of community and fun, or the relentless commitment to learning about the latest innovation, this event continues to serve as a pulse check for where data is today and where it’s going tomorrow. This year’s SQLBits at the ExCel in London […]

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2025-06-21

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Question of the Day

Creating JSON III

In a SQL Server 2025 table, called Beer, I have this data: 

BeerIDBeerName
1Becks
2Fat Tire
3Mac n Jacks
4Alaskan Amber
8Kirin
I run this code: 
SELECT JSON_OBJECTAGG(
    BeerID: BeerName )
FROM beer;
What are the results?

See possible answers