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: 2012, 2014, 2016, 2017


1 Answer


Occurs when an AlwaysOn DDL statement or Windows Server Failover Clustering command is waiting for exclusive read/write access to the runtime state of the local replica of the associated availability group. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of HADR_AR_CRITICAL_SECTION_ENTRY across the Spotlight Population

For 49 % of hours with this wait, average wait time is less than 24 ms

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

71 instances contributed data to this chart

Latency Distribution of HADR_AR_CRITICAL_SECTION_ENTRY across the Spotlight Population