HuggyBear

Born and raised in Vancouver, Canada, with a brief excursion to study in Brussels, Melbourne & Washington D.C., Hugo has been working with SQL Server since 1998. He’s busied himself as a DBA since 1999 (with mcdba & mcitp certifications in ‘01 & ‘08 respectively), as independent consultant with his own company, Intellabase Solutions, since 2002 (now part time), and has held various permanent position with Transcontinental, Sun Life Canada, and now Alithya as a consultant. He enjoys writing documentation for quick, safe infrastructure rebuilds and expansions, and most challengingly, propositions to Executives Management on how to improve enterprise Security. He has spoken at SQLteach/DevTeach, Montreal Dot Net User Group, SQLGulf, Vermont User Groups over 5 times, has a blog on SQLServerCentral, and has been recognised as a SQL Server MVP in 2010.
  • Interests: Lately (2019): windfoiling or windsurfing with a Skroka foil....amongst many other supposedly 'extreme' sports, but which are really just the norm for people raised in Lotusland aka Vancouver, BC, lower-mainland region, Sea-to-Sky country as we know it.
  • Blog: http://dbhive.blogspot.com/
  • Jobs: SQL DBA, Data Engineer, Migrator, Clusterer, Security Implementor

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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;
 

See possible answers