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: CLR
SQL Server versions: 2008, 2008 R2, 2012, 2014, 2016, 2017


1 Answer


Occurs during a wait on lock acquisition for a data structure that is used to record all virtual memory allocations that come from CLR. The data structure is locked to maintain its integrity if there is parallel access. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of CLR_MEMORY_SPY across the Spotlight Population

For 79 % of hours with this wait, average wait time is less than 0.17 ms

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

10 instances contributed data to this chart

Latency Distribution of CLR_MEMORY_SPY across the Spotlight Population