Dustin Ryan is a Data Platform Solution Architect on the Education Specialist Team Unit at Microsoft. Dustin has worked in the business intelligence and data warehousing field since 2008, has spoken at community events such as Code Camp, SQL Saturday, SQL Rally, and PASS Summit, and has a wide range of experience using the Microsoft business intelligence stack of products across multiple industries. Prior to his time at Microsoft, Dustin worked as a business intelligence consultant and trainer for Pragmatic Works, a Microsoft partner. Dustin is also an author, contributor and technical editor of books such as Applied Microsoft Business Intelligence, Professional Microsoft SQL Server 2012 Analysis Services with MDX and DAX, and others. You can learn more about Dustin at http://SQLDusty.com.

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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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