Getting Started with SQL Server In-Memory OLTP – Part 1

Getting Started with SQL Server In-Memory OLTP – Part 1

SQL Server In-Memory OLTP is a powerful engine integrated into the SQL Server Engine (version 2014 and later), optimized for Online Transaction Processing (OLTP). This article helps you getting started with this amazing technology.

Getting Started with SQL Server In-Memory OLTP – Part 1

 

An Introduction to SQL Server In-Memory OLTP

In-Memory OLTP (codenamed “Hekaton”) is a powerful engine which is fully integrated into SQL Server’s Database Engine and introduces new data structures for optimizing the performance of OLTP workloads. So, you can have memory-optimized tables, natively-compiled stored procedures, memory-optimized table variables, etc.

In-Memory OLTP offers a significant performance boost when it comes to processing large amounts of information, especially in data environments with high levels of concurrency.

In this series of articles, we will see in plain words, how we can take advantage of this technology and start using it for boosting performance of heavy workloads.

In this first article, we are going to see how easy is to create an In-Memory OLTP-enabled database and memory-optimized tables.

 

How to Create a SQL Server In-Memory OLTP-Enabled Database

OK, enough talking, let’s see some code! The below T-SQL script creates a new In-Memory OLTP-enabled database.

--create database
CREATE DATABASE InMemOLTPDB;
GO  

--use the database
USE InMemOLTPDB;
GO

--add memory-optimized file group to the database
ALTER DATABASE InMemOLTPDB ADD FILEGROUP InMemOLTPDB_mofg CONTAINS MEMORY_OPTIMIZED_DATA;

--add file for memory-optimized objects
--you can set any path you like - in this example: c:memoptdata
--if the directory does not exist you will need to create it
ALTER DATABASE InMemOLTPDB ADD FILE (name='InMemOLTPDB_mofg1', filename='C:memoptdataInMemOLTPDB_mofg1') TO FILEGROUP InMemOLTPDB_mofg;

--set the isolation level for memory-optimized tables to SNAPSHOT 
ALTER DATABASE InMemOLTPDB SET MEMORY_OPTIMIZED_ELEVATE_TO_SNAPSHOT=ON;
GO

 

How to Create Memory-Optimized Tables in SQL Server

Now you can create memory-optimized tables.

When creating memory-optimized tables you have two options:

  • Option 1: You can create a durable memory-optimized table which means that in the case of server crash or failover the data will be available as they will be recovered from transaction logs.
  • Option 2: You can create a non-durable table which means that in the case of a server crash or failover the data in the table will be lost.

The below script creates a sample durable memory-optimized table:

--Memory-Optimized Table: Durable
CREATE TABLE [dbo].[Person_Durable]
  (
     ID INT NOT NULL PRIMARY KEY NONCLUSTERED HASH WITH (BUCKET_COUNT = 1000),
     FirstName VARCHAR(50) NOT NULL,
     LastName VARCHAR(50) NOT NULL,
 Remarks VARCHAR(50) NOT NULL,  
  )WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA);
GO

 

The below script creates a sample non-durable memory-optimized table:

--Memory-Optimized Table: Non-Durable
CREATE TABLE [dbo].[Person_Non_Durable]
  (
     ID INT NOT NULL PRIMARY KEY NONCLUSTERED HASH WITH (BUCKET_COUNT = 1000),
     FirstName VARCHAR(50) NOT NULL,
     LastName VARCHAR(50) NOT NULL, 
 Remarks VARCHAR(50) NOT NULL, 
  )WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_ONLY);
GO

 

Stay tuned as in the next article we are going to run some simple experiments with In-Memory OLTP and get an indication on the performance benefits.

[Update] Check out Part 2 of this series – Now Available.

What are your views on the subject? Feel free to comment!

 

Check our other related SQL Server Performance articles.

Subscribe to our newsletter and stay up to date!

Check In-Memory OLTP Simulator!

Check out our latest software releases!

 

Rate this article: 1 Star2 Stars3 Stars4 Stars5 Stars (1 votes, average: 5.00 out of 5)

Loading...

Reference: SQLNetHub.com (https://www.sqlnethub.com)

© 2018 SQLNetHub

 

Artemakis Artemiou
Artemakis Artemiou is a Senior SQL Server and Software Architect, Author, and a 9 Times Microsoft Data Platform MVP (2009-2018). He has over 15 years of experience in the IT industry in various roles. Artemakis is the founder of SQLNetHub and TechHowTos.com. Artemakis is the creator of the well-known software tools Snippets Generator and DBA Security Advisor. Also, he is the author of many eBooks on SQL Server. Artemakis currently serves as the President of the Cyprus .NET User Group (CDNUG) and the International .NET Association Country Leader for Cyprus (INETA). Artemakis's official website can be found at aartemiou.com.