Occurs when a task is waiting for I/Os to finish. Information from Microsoft®
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.
ASYNC_IO_COMPLETION
Category: IO
SQL Server versions: 2000, 2005, 2008, 2008 R2, 2012, 2014, 2016, 2017
What is ASYNC_IO_COMPLETION?
2 Answers
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answered 3318 days ago
Spotlight Essentials
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Used to indicate a worker is waiting on a asynchronous I/O operation to complete not associated with database pages
answered 3311 days ago
Iain Shepherd
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This wait is somewhat common for most instances
For each of 4207 instances, we ranked ASYNC_IO_COMPLETION on how frequent it is compared to all other recent waits. The chart shows the total of all rankings.
Prevalence of ASYNC_IO_COMPLETION across the Spotlight Population
For 64 % of hours with this wait, average wait time is less than 570 ms
For each instance, we found all the recent hours when it had a ASYNC_IO_COMPLETION wait. We found the average latency for each of those hours.
2903 instances contributed data to this chart