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rbio_await_response
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4/11/2025 5:34:48 AM
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Began seeing a new wait time for Azure SQL Server on hyperscale tier, rbio_await_response.
It is not affecting performance, but does show up as a wait time with no sql statement associated with it.
Response from Microsoft is that this was the result of a recent patch and they are researching.
Logins coming from user {machine}\\{windows fabric user} or NTAUTHORITY\SYSTEM and they are related to some of our internal tasks like Backup or running other background tasks. You may see the same logins in sp_who2 running system threads as well. There’s no negative performance on the db because of this wait type and the queries coming from System user and the program name Fabric:/Worker.Vldb.Compute/facb87701e95. In fact, Fabric:/Worker.Vldb.Compute/facb87701e95 is basically the HS behind the covers.
We are working internally and exploring available options to correct this behavior.
A copilot generated image, including odd spelling:
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