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


1 Answer


Occurs when memory request by a small query cannot be granted immediately due to other concurrent queries. Wait time should not exceed more than a few seconds, because the server transfers the request to the main query memory pool if it fails to grant the requested memory within a few seconds. High waits may indicate an excessive number of concurrent small queries while the main memory pool is blocked by waiting queries. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of RESOURCE_SEMAPHORE_SMALL_QUERY across the Spotlight Population

For 79 % of hours with this wait, average wait time is less than 0.31 ms

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

5 instances contributed data to this chart

Latency Distribution of RESOURCE_SEMAPHORE_SMALL_QUERY across the Spotlight Population