Vishnu Gupthan

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SQLServerCentral Article

Advanced SQL Server installation using Powershell DSC

Introduction In the previous article, we learned how to install a SQL Server instance with basic parameters like InstanceName, Features, SourcePath, SQLSysAdminAccounts, etc using Powershell DSC. In this article, we'll discover how to enhance our SQL Server installation with additional configurations. We'll cover things like setting up service account credentials, custom installation directories, configuring TempDB […]

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2023-11-22

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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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