You're reading from Professional Azure SQL Managed Database Administration - Third Edition

Product typeBook

Published inMar 2021

Reading LevelBeginner

PublisherPackt

ISBN-139781801076524

Edition3rd Edition

Languages

SQL

Tools

Azure

Concepts

Databases

Authors (2):

Ahmad Osama

Shashikant Shakya

View More author details

The DTU model

In the DTU purchasing option, the amount of resources (CPUs, I/O, RAM, and storage) to be assigned to an SQL database in a particular service tier is calculated in DTUs.

DTUs guarantee that an SQL database will always have a certain amount of resources and a certain level of performance (offered under a particular DTU model) at any given point in time, independent of other SQL databases on the same SQL server or across Microsoft Azure.

The ratio for the aforementioned resources was calculated by Microsoft by running an Online Transaction Processing (OLTP) benchmark. One DTU roughly equates to 1 transaction/sec as per the benchmark.

The DTU purchasing model measures performance in DTUs instead of CPU and memory. Each DTU level and service tier provides predictable performance. The higher the DTU, the better the performance.

Note

The DTU purchasing model is not available with SQL Managed Instance.

In the DTU purchasing model, the compute and storage are bundled and priced together. For example, the 10 DTU standard service tier has a fixed storage capacity of 250 GB included within the DTU cost. Any additional storage is charged separately.

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Authors (2)

Ahmad Osama

Ahmad Osama works for Pitney Bowes Pvt. Ltd. as a technical architect and is a former Microsoft Data Platform MVP. In his day job, he works on developing and maintaining high performant, on-premises and cloud SQL Server OLTP environments as well as deployment and automating tasks using PowerShell. When not working, Ahmad blogs at DataPlatformLabs and can be found glued to his Xbox.
Read more about Ahmad Osama

Shashikant Shakya

Shashikant Shakya is a passionate technologist with decades of experience in the sphere of databases. He works for Microsoft as a senior support engineer. In his day job, he works on Azure SQL Database, Azure Database for MySQL, and PostgreSQL. Apart from his work, he is a regular speaker at the SQLBangalore community group.
Read more about Shashikant Shakya

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