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: Memory
SQL Server versions: 2005, 2008, 2008 R2, 2012, 2014, 2016, 2017


1 Answer


Occurs when Query Execution memory management tries to control access to static grant information list. This state lists information about the current granted and waiting memory requests. This state is a simple access control state. There should never be a long wait on this state. If this mutex is not released, all new memory-using queries will stop responding. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of QRY_MEM_GRANT_INFO_MUTEX across the Spotlight Population

For 95 % 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 QRY_MEM_GRANT_INFO_MUTEX wait. We found the average latency for each of those hours.

18 instances contributed data to this chart

Latency Distribution of QRY_MEM_GRANT_INFO_MUTEX across the Spotlight Population