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


The publisher for an availability replica event (such as a state change or configuration change) is waiting for exclusive read/write access to the runtime state of an event subscriber that corresponds to an availability database. Internal use only. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of HADR_DBR_SUBSCRIBER across the Spotlight Population

For 26 % of hours with this wait, average wait time is less than 0.01 ms

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

21 instances contributed data to this chart

Latency Distribution of HADR_DBR_SUBSCRIBER across the Spotlight Population