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


1 Answer


Occurs while performing synchronization on a callback list in order to remove a callback. It is not expected for this counter to change after server initialization is completed. Information from Microsoft®

Very rare

This wait never occurs for most instances

For each of 4207 instances, we ranked SOS_CALLBACK_REMOVAL on how frequent it is compared to all other recent waits. The chart shows the total of all rankings.

Prevalence of SOS_CALLBACK_REMOVAL across the Spotlight Population

For 99 % of hours with this wait, average wait time is less than 0.053 ms

For each instance, we found all the recent hours when it had a SOS_CALLBACK_REMOVAL wait. We found the average latency for each of those hours.

18 instances contributed data to this chart

Latency Distribution of SOS_CALLBACK_REMOVAL across the Spotlight Population