A company runs a global e-commerce application that needs to store product catalog data. The data is JSON documents with variable schemas. The application requires single-digit millisecond read and write latencies at any scale and must support automatic synchronous replication across multiple Azure regions for high availability and low latency reads from any region. Which Azure data service should they choose?

Azure SQL Database with active geo-replication

Active geo-replication provides disaster recovery and read-only replicas, but it does not support multi-region writes with single-digit millisecond latencies for global distribution.

Azure Table Storage

Azure Table Storage is a NoSQL key-value store that does not provide multi-region writes with low latency or native JSON document support.

Azure Database for PostgreSQL with read replicas

Azure Database for PostgreSQL with read replicas supports read scaling across regions but not multi-region writes with single-digit millisecond latencies.

What does this AZ-305 question test?

Static NAT maps one inside address to one outside address.

What is the correct answer to this question?

The correct answer is: Azure Cosmos DB with multi-region writes — Azure Cosmos DB is designed for globally distributed, low-latency applications with multi-region writes and automatic replication. It natively supports JSON documents and provides guaranteed single-digit millisecond latencies at the 99th percentile. Azure SQL Database with active geo-replication does not offer multi-region writes with the same low latency. Azure Table Storage is for key-value data and lacks JSON document support. Azure Database for PostgreSQL has read replicas but not multi-region writes with low latency.

What should I do if I get this AZ-305 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.