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Category: SQL 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

olved steries #1 – SQL FCI Failovers

April 29, 2021 Sean Gallardy 7 Comments

Overall Introduction I’ve had some feedback that people would like to know some of the stuff I see and how…

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Posted in: NotASQLServerProblem, Performance, Security, SQL Server Filed under: Always On, Cheater Cheater, Drivers, FCI, GottaLoveSecurity, HADR, IRPs, NotReallyASQLProblem, olved steries, Security, SQL Server, Windows IO

Availability Group Long Failover Times

April 18, 2021 Sean Gallardy 1 Comment

One of the most common issues I look at from day to day is some variation of the question. “Why…

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Posted in: CUs and GDRs, HA/DR, Performance, SQL Server Filed under: Antivirus, Availability Groups, Drivers, Failover, HADR, Patching, Performance, SQL Server

Undo of Redo – Reverting (and Initializing)

April 12, 2021 Sean Gallardy 1 Comment

Departure Hopefully, you’re not finding this entry because you’re scouring the web for what reverting means while your production server…

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Posted in: HA/DR, Performance, SQL Server Filed under: Always On, Availability Groups, Recovery, SQL Server

Do You Really Have A HA Issue?

March 15, 2021 Sean Gallardy

I tend to be involved in many HA related issues, as is the nature of my current work agreement. The…

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Posted in: HA/DR, Performance, SQL Server Filed under: HADR, Performance, Planning, SQL Server

Refresh DEK for DBID and FileID Errorlog Messages

February 20, 2021 Sean Gallardy

Be Careful What You Wish For Just a quick PSA as I’ve had a bunch of questions come up around…

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Posted in: CUs and GDRs, SQL Server Filed under: CUs, NotAProblem, PSA, SQL Server, SQL2019

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