seniorT-SQL
What is execution plan skew in parallel queries?
Updated May 17, 2026
Short answer
Plan skew occurs when work is unevenly distributed across parallel threads.
Deep explanation
In parallel execution, rows are distributed across worker threads. If distribution is uneven due to poor partitioning or skewed data, some threads finish early while others lag, causing CXPACKET or CXCONSUMER waits.
Unlock with a Pro subscription to view this section.
View pricingReal-world example
No real-world example available yet.
Unlock with a Pro subscription to view this section.
Upgrade to ProCommon mistakes
No common mistakes listed yet.
Unlock with a Pro subscription to view this section.
Upgrade to ProFollow-up questions
No follow-up questions available yet.
Unlock with a Pro subscription to view this section.
Upgrade to Pro