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Azure SQL Database vs Cosmos DB

Azure SQL Database

Azure Cosmos DB

Type of Database

Relational database

NoSQL database

Features

Has several SQL deployment options for different kinds of workloads – SQL databases, SQL managed instances, SQL virtual machines.

Delivers single-digit millisecond response times and instant scalability.

Storage Size

  • 100 TB for SQL database

  • 8 TB for SQL managed instance

  • 256 TB for SQL virtual machine

Unlimited storage per database and container.

Availability

SQL database – 99.995% availability

SQL managed instance and SQL virtual machine – 99.99% availability

Single-region – 99.99%

Multi-region – 99.999%

Backups

With long-term backup retention policy, database backups are automatically retained in separate Azure Blob storage containers (up to 10 years).

Periodic backup mode (default) – the backup is created at a periodic interval and the data can be restored by creating a request with the support team.

Continuous backup mode – allows you to restore your data to any point of time within the last 30 days.

Encryption

Supports encryption at rest for Microsoft-managed service side and client-side encryption.

Supports Transparent Data Encryption for server encryption.

The Azure SQL Database supports RSA 2048-bit customer-managed keys in Azure Key Vault.

CosmosDB encrypts data at rest and the keys are managed by Microsoft. You can also use your own encryption keys (customer-managed keys).

Maintenance

Supports serverless compute tier for Azure SQL Database.

Supports serverless containers that can serve thousands of requests per second.

Pricing

The resources are billed hourly at a fixed rate based on the service tier and compute size you choose.

The cost of all database operations is normalized and expressed as request units (RU).

Specific billing options for each database operation models: Provisioned Throughput and Serverless.

Use cases

Azure SQL is based on SQL Server engine, you can easily migrate applications and continue to use the tools, languages, and resources that you’re familiar with.

Azure Cosmos DB is used for web, mobile, gaming, and IoT application that needs to handle massive amounts of data, reads, and writes at a global scale.

 

Sources:
https://docs.microsoft.com/en-us/azure/azure-sql/azure-sql-iaas-vs-paas-what-is-overview
https://docs.microsoft.com/en-us/azure/cosmos-db/relational-nosql

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