PWAIT_ALL_COMPONENTS_INITIALIZED appears to be a startup gate: background tasks (the SQLOS resource monitor among them, judging from its call stacks) waiting during SQL Server startup for the engine components they depend on to finish initialising. Documentation is absent, but the behaviour is consistent: it accrues around instance start and then goes quiet.
Another of the small startup-phase markers.
Is It a Problem?
No; it has not been a contention point and is filtered as benign. Its total is part of the startup sequence’s shape, alongside SLEEP_MASTERDBREADY and friends, and carries no steady-state signal.
If instance startup is genuinely slow, the error log’s startup progress messages and the startup sleep waits (see the startup sleeps page) reconstruct where the time went far better than this gate.
Common Causes
- Instance startup ordering background tasks behind component initialisation.
What To Do
- Filter it out of wait analysis.
- Investigate slow startups through the error log timeline when needed.
How To See It
Rank waits with Get-WaitStatistics; a small entry after each restart, then silence.
Part of the SQL Server Wait Types Library.
Related deep dive: SOS_SCHEDULER_YIELD Wait Type.
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