Microsoft Azure Architect Design (AZ-301) Practice Exam

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If you need to improve the availability of your application using Azure SQL Database, which feature should be implemented?

Always On availability groups
Backup recovery
Replication
Scaling up service tiers

The correct answer is: Always On availability groups

Implementing Always On availability groups is the optimal choice for enhancing the availability of an application using Azure SQL Database. This feature provides high availability and disaster recovery by allowing multiple copies of the database to be hosted across different servers or availability zones. Always On ensures that during planned maintenance or unexpected outages, there is minimal impact on application availability. It allows for automatic failover mechanisms, meaning that if the primary database becomes unavailable, the system can switch to a secondary replica seamlessly, ensuring continuous service for users. While backup recovery is essential for data protection, it does not directly provide high availability; it is more focused on restoring data after failures have occurred. Replication can enhance data availability and can be used for scaling reads, but it is generally less robust than Always On for providing synchronous data access across replicas. Scaling up service tiers can improve performance but doesn't necessarily lead to increased availability; it primarily deals with performance characteristics rather than fault tolerance or redundancy. Therefore, for directly addressing availability concerns, Always On availability groups are the most effective solution in the context of Azure SQL Database.