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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.

DBCC_SCALE_OUT_EXPR_CACHE

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

What is DBCC_SCALE_OUT_EXPR_CACHE?

Never

This wait has never occurred recently

DBCC_SCALE_OUT_EXPR_CACHE has not occurred recently on 4207 instances checked.

Prevalence of DBCC_SCALE_OUT_EXPR_CACHE across the Spotlight Population