Azure VS On Premise SQL

The difference between a SQL Server in Azure vs. SQL Database is that SQL Server is more Infrastructure as a service IaaS v Platform as a service (PaaS). This means that in regards to a SQL Database, you don’t have to worry as much about the maintenance/infrastructure as you would with a SQL Server as a VM.

From lift-and-shift migrations, to modernization of existing applications, to building modern cloud services, Azure SQL is a modern SQL platform that offers several deployment options, powered by an industry leading Microsoft SQL Server engine. Azure SQL is designed to support a wide variety of application patterns with different levels of control over the underlying platform to meet the most demanding migration and modernization requirements. Azure SQL eliminates the complexity of managing diverse collections of SQL Server-based applications at scale by providing a single, unified management experience.

One of the first things to understand in any discussion of Azure versus on-premises SQL Server databases is that you can use it all. Microsoft’s data platform leverages SQL Server technology and makes it available across physical on-premises machines, private cloud environments, third-party hosted private cloud environments, and the public cloud. SQL Server on Azure virtual machines (SQL virtual machines) enables you to meet unique and diverse business needs through a combination of on-premises and cloud-hosted deployments, while using the same set of server products, development tools, and expertise across these environments.



In Azure, you can have your SQL Server workloads running as a hosted service (PaaS), or a hosted infrastructure (IaaS). Within PaaS, you have multiple deployment options and service tiers within each deployment option. The key question that you need to ask when deciding between PaaS or IaaS is do you want to manage your database, apply patches, and take backups, or do you want to delegate these operations to Azure.

Databases offer the following deployment options:

As A Single Database

with its own set of resources managed via a database server. A single database is similar to a contained database in SQL Server. This option is optimized for modern application development of new cloud-born applications. Hyperscale and serverless options are available.

An Elastic Pool

which is a collection of databases with a shared set of resources managed via a database server. Single databases can be moved into and out of an elastic pool. This option is optimized for modern application development of new cloud-born applications using the multi-tenant SaaS application pattern. Elastic pools provide a cost-effective solution for managing the performance of multiple databases that have variable usage patterns.

A Database Server

which is used to manage groups of single databases and elastic pools. Database servers act as a central administrative point for multiple single or pooled databases, logins, firewall rules, auditing rules, threat detection policies, and failover groups.

AZURE SQL or SQL Server: which one is appropriate?

Azure SQL is a cloud service built on the SQL Server line, so it shares many features with local SQL Server.


Differences Between SQL Server and Azure SQL

Azure SQL is based on SQL Server and has many similarities in functionality and compatibility. But that does not mean they are the same. In fact, contrary to what many people think, Azure SQL is different from the cloud version of SQL Server. Indeed, there are many fundamental differences between the two.

It is essential to understand the fundamentals before moving on to the exact difference. In SQL Server, the database is the only entity on the database server, but in SQL Azure, a single database can host different client databases. In other words, Azure SQL is multi-tenant and shares physical resources with all clients using this service.