Waitopedia is a comprehensive resource of information about SQL Server waits.

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.


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

This is an idle wait and so it can be safely ignored.


1 Answer


May occur after startup of instance, while internal data structures are initializing. Will not recur once data structures have initialized. Information from Microsoft®


This wait has never occurred recently

BUILTIN_HASHKEY_MUTEX has not occurred recently on 4207 instances checked.

Prevalence of BUILTIN_HASHKEY_MUTEX across the Spotlight Population