Prakash Heda

Prakash Heda works as Sr. Database Administrator at Advent Software. His expertise includes Performance Tuning/Troubleshooting, high availability, SAN configuration and windows administration. He has 13+ years of experience managing enterprise-wide data needs in both high volume transactional and data warehouse environments. Prakash holds certifications for MCDBA and MCITP. His background includes administration & development using VB/ASP/SSIS using SQL Server 2000, 2005 and 2008/R2 and SQL server 2012. He is an active member of PASS, SQL Saturday. He’s a frequent presenter at user groups, SQL Saturdays, and other community events. He is also an avid tweeter, blogger and runner.
  • Interests: Computers, Chess, Reading

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T-SQL Tuesday #193 – A Note to Your Past, and a Warning from Your Future

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I haven’t posted in a while (well, not here at least since I’ve been...

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Refactoring SQL Code

By Steve Jones - SSC Editor

Comments posted to this topic are about the item Refactoring SQL Code, which is...

The Read Committed Snapshot Isolation behaviour

By Alessandro Mortola

Comments posted to this topic are about the item The Read Committed Snapshot Isolation...

Working with JSON/JSONB Data in PostgreSQL using Python

By sabyda

Comments posted to this topic are about the item Working with JSON/JSONB Data in...

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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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