Tracy Boggiano

Tracy is the Database Superhero for ChannelAdvisor. She has spent over 20 years in IT and has used SQL Server since 1999. Tracy covers all aspects of administration and deals heavily with performance tuning and high availability and disaster recovery. Tracy is a co-organizer of a Special Interest Group (SIG) dedicated to advanced DBA topics in our local user group TriPass. She is also the founder of http://WeSpeakLinux.com. Before she worked full-time as a DBA she was formally a developer and network administrator. She also tinkered with databases in middle/high school to keep her sports card collection organized.

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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;
 

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