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: 2008, 2008 R2, 2012, 2014, 2016, 2017


1 Answer


Occurs during internal synchronization within SQL Server networking components. Information from Microsoft®

Somewhat common

This wait is somewhat common for most instances

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

Prevalence of SNI_CRITICAL_SECTION across the Spotlight Population

For 72 % of hours with this wait, average wait time is less than 0.026 ms

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

3295 instances contributed data to this chart

Latency Distribution of SNI_CRITICAL_SECTION across the Spotlight Population