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 when a task is started in a synchronous manner. Most tasks in SQL Server are started in an asynchronous manner, in which control returns to the starter immediately after the task request has been placed on the work queue. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of SOS_SYNC_TASK_ENQUEUE_EVENT across the Spotlight Population

For 82 % of hours with this wait, average wait time is less than 0.21 ms

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

488 instances contributed data to this chart

Latency Distribution of SOS_SYNC_TASK_ENQUEUE_EVENT across the Spotlight Population