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: 2000, 2005, 2008, 2008 R2, 2012, 2014, 2016, 2017


1 Answer


Occurs when a task is waiting on a latch for a buffer that is in an I/O request. The latch request is in Update mode. Long waits may indicate problems with the disk subsystem. Information from Microsoft®

Very common

This wait is very common for most instances

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

Prevalence of PAGEIOLATCH_UP across the Spotlight Population

For 45 % of hours with this wait, average wait time is less than 0.5 ms

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

4149 instances contributed data to this chart

Latency Distribution of PAGEIOLATCH_UP across the Spotlight Population