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: IO
SQL Server versions: 2005, 2008, 2008 R2, 2012, 2014, 2016, 2017


1 Answer


Occurs when SQL Server waits for a bulkload I/O to finish. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of IMPPROV_IOWAIT across the Spotlight Population

For 40 % of hours with this wait, average wait time is less than 0.86 ms

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

149 instances contributed data to this chart

Latency Distribution of IMPPROV_IOWAIT across the Spotlight Population