Waits And Latches

Paul Randal has come out with his comprehensive wait and latch type library:

I present to the community a comprehensive library of all wait types and latch classes that have existed since SQL Server 2005 (yes, it includes 2016 waits and latches).

The idea is that over time, this website will have the following information about all wait types and latch classes:

  • What they mean

  • When they were added

  • How they map into Extended Events (complete for all entries already)

  • Troubleshooting information

  • Example call stacks of where they occur inside SQL Server

  • Email link for feedback and questions

It’s not complete yet, but entries are thorough.

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When Faster Disk Increases WRITELOG Waits

Paul Randal explains that WRITELOG waits can potentially increase as you get faster disk: I was contacted last week by someone who was confused about the WRITELOG wait type. They were seeing lots of these waits, with an average wait time of 18ms. The log was stored on a Raid-1 array, using locally-attached spinning disks in […]

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Performance Troubleshooting Plus Wait Stats

Jeff Mlakar builds up some thoughts on performance troubleshooting, including wait stats: Queries go through the cycle of the SPIDS / worker threads waiting in a series like this. A thread uses the resource e.g. CPU until it needs to yield to another that is waiting. It then moves to an unordered list of threads […]

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