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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.

INDEX_USAGE_STATS_MUTEX

Category: Other
SQL Server versions: 2005

What is INDEX_USAGE_STATS_MUTEX?

Never

This wait has never occurred recently

INDEX_USAGE_STATS_MUTEX has not occurred recently on 4207 instances checked.

Prevalence of INDEX_USAGE_STATS_MUTEX across the Spotlight Population