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: Latch
SQL Server versions: 2000, 2005, 2008, 2008 R2, 2012, 2014, 2016, 2017

What is LATCH_UP?

1 Answer


Occurs when waiting for an UP (update) latch. This does not include buffer latches or transaction mark latches. A listing of LATCH_* waits is available in sys.dm_os_latch_stats. Note that sys.dm_os_latch_stats groups LATCH_NL, LATCH_SH, LATCH_UP, LATCH_EX, and LATCH_DT waits together. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of LATCH_UP across the Spotlight Population

For 89 % of hours with this wait, average wait time is less than 69 ms

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

452 instances contributed data to this chart

Latency Distribution of LATCH_UP across the Spotlight Population