Book Image

Getting Started with SQL Server 2014 Administration

By : Gethyn Ellis
Book Image

Getting Started with SQL Server 2014 Administration

By: Gethyn Ellis

Overview of this book

Table of Contents (13 chapters)
Getting Started with SQL Server 2014 Administration
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Delayed Durability and potential data loss


In this section, you will discover how it is possible for you to lose data contained in a committed transaction using Delayed Durability.

The following script will create a database called DB1 on a SQL Server 2014 instance:

--Create database DB1
CREATE DATABASE [DB1]
GO

Then you will create a table in the DB1 database called t1. It will be a simple table with two columns called ID and Name:

USE DB1
GO
CREATE TABLE t1 (
  ID int,
  Name Varchar(20))

The following script inserts two rows into the table t1:

USE [DB1]
GO

INSERT INTO [dbo].[t1]
           ([ID]
           ,[Name])
     VALUES
           (1,'Seth'),
           (2,'Jake')
GO

The following script will change the database level Delayed Durability option to Forced. Therefore, all transactions will use Delayed Durability:

USE [master]
GO
ALTER DATABASE [DB1] SET DELAYED_DURABILITY = FORCED WITH NO_WAIT
GO

We will then set up a performance monitor and configure it to monitor log flushes. I am going...