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: 2012, 2014, 2016, 2017

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


1 Answer


A background task is waiting for the termination of a background task that processes Windows Server Failover Clustering notifications. Internal use only. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of HADR_NOTIFICATION_WORKER_TERMINATION_SYNC across the Spotlight Population

For 88 % 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 HADR_NOTIFICATION_WORKER_TERMINATION_SYNC wait. We found the average latency for each of those hours.

16 instances contributed data to this chart

Latency Distribution of HADR_NOTIFICATION_WORKER_TERMINATION_SYNC across the Spotlight Population