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Category: HA/DR

SQL Server 2022 – Contained AGs – Overview

May 24, 2022 Sean Gallardy 1 Comment

You’ve Asked, It’s Now Here! The largest complaint, by far, for Availability Groups (AG) has been that system databases could…

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Posted in: HA/DR, SQL Server Filed under: Availability Groups, Contained AGs, SQL Server, SQL2022

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

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

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

Network Throughput Hysteria

January 29, 2021 Sean Gallardy 6 Comments

I Think My Knee Hurts, I Just Can’t Prove It Hopefully, you really do know if your knee hurts or…

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Posted in: HA/DR, SQL Server Filed under: Always On, Gotta Test, networking, SQL Server

VM Backups + SQL HA = SQL AlwaysOff

September 21, 2020 Sean Gallardy 1 Comment

On, Off, On, Off, On… I see this more often than I’d like to, so count this as your PSA…

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Posted in: HA/DR, Maintenance, NotASQLServerProblem, SQL Server Filed under: Backups, HADR, SQL Server, Veeam

Using Distributed Network Names with Availability Groups

August 23, 2020 Sean Gallardy 1 Comment

I’ve been asked this question a few times, so I feel it’s worth writing about, which is, “Are Distributed Network…

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Posted in: HA/DR, SQL Server Filed under: Availability Groups, DNN, FCI, NotQuiteYet, WSFC

Attempting to recycle all monitors that have loaded the DLL sqsrvres.dll or hadrres.dll and you notice a SQL FCI/AG failed health checks

August 20, 2020 Sean Gallardy

I won’t say I told you so… I will, however, point out common AG question #8… I’m not sure why…

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Posted in: HA/DR, Maintenance, NotASQLServerProblem, SQL Server Filed under: HADR, Patching, SQL Server, WSFC

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