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Asked: 2026-06-12T00:17:37+00:00

Where can i find documentation about wait types (SQL Server 2008 R2): Select *

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Where can i find documentation about wait types (SQL Server 2008 R2):

Select * from sys.dm_os_wait_stats  where wait_type like 'PREEMPTIVE_OS%'

For example “PREEMPTIVE_OS_CRYPTIMPORTKEY”.
there is no such wait type documented in msdn..

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  1. Editorial Team

    SQL Server normally runs threads in cooperative multitasking. When it calls to the OS, it has to change to preemptive multitasking. So a PREEMPTIVE_OS% wait means SQL Server is waiting for the OS to do something.

    You can find documentation for the thing it’s waiting on by stripping the PREEMPTIVE_OS_ part. For example, the documentation for CryptImportKey can be found here.

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