What’s the difference between Azure SQL Database and Azure SQL Managed Instance?
Câu trả lời What’s the difference between Azure SQL Database and Azure SQL Managed Instance?
Azure SQL Database and Azure SQL Managed Instance are both cloud-based database services provided by Microsoft Azure, but they cater to different needs and offer distinct features. Here’s a detailed comparison:
Azure SQL Database
Overview:
Type: Platform-as-a-Service (PaaS)
Best For: Modern cloud applications that need a fully managed database service with minimal administrative overhead.
Deployment Options: Single databases and elastic pools.
Key Features:
Scalability: Supports dynamic scaling with no downtime. Elastic pools allow for resource sharing among multiple databases, which is ideal for SaaS applications[1][3][19].
Management: Fully managed by Microsoft, including automatic patching, backups, and updates[1][3][16].
High Availability: Offers 99.99% to 99.995% availability with built-in high availability and disaster recovery options[1][3][19].
Security: Advanced security features such as data encryption, threat detection, and compliance with various standards[1][3][16].
Performance Tuning: Built-in intelligence for automatic performance tuning and query optimization[1][16][19].
Cost: Generally more cost-effective than Managed Instance, with a pay-as-you-go pricing model[1][4][13].
Limitations:
Compatibility: Less compatible with on-premises SQL Server features. Some advanced SQL Server features like cross-database queries and SQL Server Agent are not supported[1][4][5][10].
Control: Limited control over the underlying infrastructure and database instance configuration[1][4][10].
Azure SQL Managed Instance
Overview:
Type: Platform-as-a-Service (PaaS)
Best For: Lift-and-shift migrations of on-premises SQL Server applications to the cloud with minimal changes.
Deployment Options: Single instance or instance pools.
Key Features:
Compatibility: Near 100% compatibility with on-premises SQL Server, supporting instance-level features like cross-database queries, SQL Server Agent, and CLR integration[1][2][3][4][5].
Management: Fully managed by Microsoft, including automatic patching, backups, and updates, but with more control over instance-level settings[1][2][3][4].
High Availability: Offers 99.99% availability with built-in high availability and disaster recovery options[1][2][3][4].
Security: Advanced security features, including VNet integration for network isolation and compliance with various standards[1][2][3][4].
Performance: Supports advanced SQL Server features like In-Memory OLTP and Service Broker, which can enhance performance for specific workloads[1][2][3][4][6].
Migration: Designed for easy migration from on-premises SQL Server with minimal changes, using tools like Azure Data Migration Service[1][2][3][4].
