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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.

UCS_MEMORY_NOTIFICATION

Category: Other
SQL Server versions: 2012, 2014, 2016, 2017

What is UCS_MEMORY_NOTIFICATION?

Never

This wait has never occurred recently

UCS_MEMORY_NOTIFICATION has not occurred recently on 4207 instances checked.

Prevalence of UCS_MEMORY_NOTIFICATION across the Spotlight Population