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Author: Sean Gallardy

Auditing To the Security Event Log – SQL Server Error 33204 and OS Error 8

March 22, 2022 Sean Gallardy 1 Comment

It’s Great When No One Asks Questions You’re taking the best steps to track what goes on in your instance…

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Posted in: Security, SQL Server Filed under: Auditing, Security, SQL Server, Windows Server

When Using Availability Groups, Beware of Mirroring Behaviors

January 21, 2022 Sean Gallardy 7 Comments

Many DBAs haven’t had the experience of using database mirroring, since it was deprecated in 2012 when availability groups were…

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Posted in: HA/DR, SQL Server Filed under: App Compat, Drivers, HADR, Mirroring, SQL Server

What Interests You?

December 5, 2021 Sean Gallardy

I’ve been writing some technical, some troubleshooting, but all items that come up often enough without a resource that when…

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Posted in: General Info, Non-Technical Filed under: Your Thoughts

Demystifying Dumps: Stalled Dispatcher

December 1, 2021 Sean Gallardy 1 Comment

Hey Dispatch, We Have a Code 8 If you’ve been following with the series of demystifying dumps then you’re probably…

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Posted in: Dumps, SQL Server Filed under: Demystified, Dump, Dumps, Non-Yielding, SQL Server, stalled, stalled dispatcher, Windows, Windows Server

Demystifying Dumps: Non-Yielding (Stalled) IOCP

November 18, 2021 Sean Gallardy 2 Comments

What’s an IOCP? IO Completion Ports are a set of Windows APIs which allow for efficient, fast, multithreaded asynchronous IO.…

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Posted in: Dumps, SQL Server Filed under: Debugging, Demystified, Dump, Dumps, IOCP, Non-Yielding, SQL Server, Windows, Windows Server

Understanding the HADR_SYNC_COMMIT wait

September 22, 2021 Sean Gallardy 2 Comments

Initially I thought to myself, “this is the most misunderstood wait type that exists in the HA space for SQL…

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Posted in: HA/DR, SQL Server, Waits Filed under: AGs, Always On, Availability Groups, HADR, HADR_SYNC_COMMIT, Monitoring, SQL Server, Synchronous Commit, Threads, Wait Types, Waits

Demystifying Dumps: Access Violation

August 29, 2021 Sean Gallardy 1 Comment

Access Violations (AV) are another common error that will cause SQL Server to take a memory dump. These can occur…

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Posted in: Dumps, SQL Server Filed under: Access Violation, Debugging, Demystified, Dump, Dumps, SQL Server, Windows, Windows Server

Demystifying Dumps: Non-Yielding Scheduler

August 23, 2021 Sean Gallardy 6 Comments

One of the most common items that will cause a memory dump in SQL Server is a non-yielding scheduler (generally…

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Posted in: Dumps, SQL Server Filed under: Debugging, Demystified, Dump, Dumps, Scheduling, SQL Server, SQLOS, Threads, WinDBG, Workers

olved steries #2 – Slow Restore

August 8, 2021 Sean Gallardy 1 Comment

Issue Introduction In this olved stery the problem comes as a slow database restore. That’s what I was given, that’s…

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Posted in: NotASQLServerProblem, olved stery, Performance, SQL Server Filed under: Backups, network latency, olved stery, Performance, restores, SQL Server

Possible configuration error: 1000000 IO requests allocated

May 23, 2021 Sean Gallardy 1 Comment

You’ve won! If, somehow, you’ve managed to see this error in your errorlog then congratulations, you’ve won an instance of…

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Posted in: Performance, SQL Server, Storage Filed under: Asynchronous IO, Performance, SQL Server, Storage, Weird Errors

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