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: 2016, 2017


1 Answer


Occurs while allocating memory from either the internal SQL Server memory pool or the operation system. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of MEMORY_ALLOCATION_EXT across the Spotlight Population

For 11 % of hours with this wait, average wait time is around 0.0029 ms

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

928 instances contributed data to this chart

Latency Distribution of MEMORY_ALLOCATION_EXT across the Spotlight Population