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Category: DMVs

Read Scale Availability Group – Failed to update Replica status due to exception 35222.

November 21, 2023 Sean Gallardy

Read Scale Availability Groups can be pretty useful in the right places and for the right things and were a…

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Posted in: DMVs, HA/DR, SQL Server Filed under: Always On, Availability Groups, benign, HADR, read-scale, SQL Server, Weird Errors, WSFC

model_msdbdata and log, model_replicatedmaster and log – What are they?

July 3, 2023 Sean Gallardy 4 Comments

There was a question that came up on the MCM mailing list about what are these files: model_msdbdata.mdf, model_msdblog.ldf, model_replicatedmaster.mdf,…

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Posted in: DMVs, HA/DR, SQL Server Filed under: Availability Groups, general, HADR, SQL Server, SQL2022

What Are PREEMPTIVE Waits And How Can They Kill Performance

November 27, 2022 Sean Gallardy 3 Comments

Primer If you haven’t already read up on cooperative and preemptive scheduling or aren’t sure what those are, please read…

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Posted in: DMVs, Performance, SQL Server, Waits Filed under: Debugging, Demystified, Monitoring, Non-Yielding, Performance, SQL Server, Threads, Wait Types, WinDBG, Windows

Stop using Sys.dm_hadr_cluster_members for “quorum” information

May 9, 2020 Sean Gallardy 1 Comment

Update 5/24/2022: I’ve updated the DMV to reflect the various node and witness dynamic settings with a new column at…

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Posted in: DMVs, HA/DR, SQL Server Filed under: DMV, DoesntWorkLikeYoudThink, HADR, Monitoring, SQL Server, WSFC

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