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 when an Extended Events session that is using asynchronous targets is started or stopped. This wait indicates either of the following:

  • An Extended Events session is registering with a background thread pool.
  • The background thread pool is calculating the required number of threads based on current load. Information from Microsoft®
Very rare

This wait never occurs for most instances

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

Prevalence of XE_DISPATCHER_CONFIG_SESSION_LIST across the Spotlight Population

For 86 % 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 XE_DISPATCHER_CONFIG_SESSION_LIST wait. We found the average latency for each of those hours.

78 instances contributed data to this chart

Latency Distribution of XE_DISPATCHER_CONFIG_SESSION_LIST across the Spotlight Population