David Fowler and Adrian Buckman, two database nerds who love nothing more than to spend their time, reading about, researching and sharing all things SQL Server.

David is a DBA with over 15 years production experience of SQL Server, from version 6.5 through to 2016. He has worked in a number of different settings and is currently the technical lead at one of the largest software companies in the UK.

After working in the motor trade for over 11 years Adrian decided to give it all up to persue a dream of working in I.T. Adrian has over 3 years of experience working with SQL server and loves all things SQL, Adrian currently works as a Database Administrator for one of the UK’s Largest Software Companies.

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Distributed Availability Group Dashboard

The Distributed Availability Group Dashboard can be downloaded from our GitHub repo. https://github.com/SQLUndercover/UndercoverToolbox/blob/master/DAG%20Dashboard.pbix. This comes off of the back of my last post looking at using a distributed availability...

2025-04-14 (first published: )

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Blogs

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Question of the Day

The Read Committed Snapshot Isolation behaviour

I am currently working with Sql Server 2022 and AdventureWorks database. First of all, let's set the "Read Committed Snapshot" to ON: 

use master;
go

alter database AdventureWorks set read_committed_snapshot on with no_wait;
go
Then, from Session 1, I execute the following code: 
--Session 1
use AdventureWorks;
go

create table ##t1 (id int, f1 varchar(10));
go

insert into ##t1 values (1, 'A');
From another session, called Session 2, I open a transaction and execute the following update: 
--Session 2
use AdventureWorks;
go

begin tran;
update ##t1 
set f1 = 'B'
where id = 1;
Now, going back to Session 1, what happens if I execute this statement? 
--Session 1
select f1
from ##t1
where id = 1;
 

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