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The description shown below is the top answer as voted by the Spotlight community.

The charts are based on 2.1 TB of data collected from 4207 instances uploaded by 323 Spotlight users over an 8 week period.

QUERY_NOTIFICATION_SUBSCRIPTION_MUTEX

Category: Other
SQL Server versions: 2005, 2008, 2008 R2, 2012, 2014, 2016, 2017

What is QUERY_NOTIFICATION_SUBSCRIPTION_MUTEX?

1 Answer

 

Occurs during state synchronization for transactions in Query Notifications. Information from Microsoft®

Never

This wait has never occurred recently

QUERY_NOTIFICATION_SUBSCRIPTION_MUTEX has not occurred recently on 4207 instances checked.

Prevalence of QUERY_NOTIFICATION_SUBSCRIPTION_MUTEX across the Spotlight Population