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


1 Answer


Occurs when waiting for a shared mode latch on a marked transaction. Transaction mark latches are used for synchronization of commits with marked transactions. Information from Microsoft®

Very rare

This wait never occurs for most instances

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

Prevalence of TRAN_MARKLATCH_SH across the Spotlight Population

For 54 % of hours with this wait, average wait time is less than 20 ms

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

4 instances contributed data to this chart

Latency Distribution of TRAN_MARKLATCH_SH across the Spotlight Population