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: 2008, 2008 R2, 2012, 2014, 2016, 2017


1 Answer


Occurs when either of the following conditions is true:

  • An Extended Events session is configured for no event loss, and all buffers in the session are currently full. This can indicate that the buffers for an Extended Events session are too small, or should be partitioned.
  • Audits experience a delay. This can indicate a disk bottleneck on the drive where the audits are written. Information from Microsoft®
Very rare

This wait never occurs for most instances

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

Prevalence of XE_BUFFERMGR_FREEBUF_EVENT across the Spotlight Population

For 14 % of hours with this wait, average wait time is around 22 ms

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

30 instances contributed data to this chart

Latency Distribution of XE_BUFFERMGR_FREEBUF_EVENT across the Spotlight Population