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On the Internet, the Walls Have Ears

I received a sobering reminder this week of a lesson we all have learned or should have learned long ago. Something I said online came back around months later...

2025-03-26 (first published: )

382 reads

Blog Post

T-SQL Tuesday 184 - Mentorship

T-SQL Tuesday is a monthly blog party hosted by a different community member each month. This month, Deborah Melkin
(blog) asks us to talk about our relationship with mentoring and...

2025-03-11

16 reads

Blog Post

The Mysterious Empty Table

It seems like no matter how long you work with a system beyond a trivial size, you’ll find something new every so often. A little while ago, I found...

2025-02-26 (first published: )

387 reads

Blog Post

SQL Query Stats via Powershell

Sometimes, work tasks and questions that come up in the SQL Server Community Slack coincide.
A couple weeks ago, DrData asked
With SET STATISTICS IO ON, is there really no way...

2024-10-07 (first published: )

287 reads

Blog Post

SQL Saturday Syracuse 2024 Recap

First Things First Thanks to every who came to my session, Asnwering the Auditor’s Call with Automation. Slides and scripts are posted to my Github.
The Event! This was Syracuse’s...

2024-09-08

12 reads

Blogs

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One feature that I have been waiting for years! The new announcement around optimize...

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By

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The AI Bubble and the Weak Foundation Beam

By dbakevlar

Comments posted to this topic are about the item The AI Bubble and the...

data type gets lost in data flow

By stan

Hi, in a simple oledb source->derived column->oledb destination    data flow, 2 of my...

i noticed the sqlhealth extende event is on by default , so can i reduce

By rajemessage 14195

hi, i noticed the sqlhealth extended event is on by default , and it...

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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