Microsoft Azure Data Fundamentals DP-900 Practice Question
A company wants to store millions of IoT sensor readings that arrive with slightly different JSON fields and must be retrieved quickly by device ID and timestamp. Which type of database best meets this requirement?
A relational database, for example Azure SQL Database
A graph database, for example Azure Cosmos DB Gremlin API
A document database, for example Azure Cosmos DB with the Core (SQL) API
A cloud data warehouse, for example Azure Synapse Analytics
Document databases are designed to store semi-structured data such as JSON without requiring a fixed relational schema. Azure Cosmos DB using the Core (SQL) API lets you ingest records that differ in structure and still query them efficiently on properties like device ID and timestamp. Relational databases expect a predefined table schema, graph databases are optimized for relationship traversal rather than time-series ingestion, and data warehouses focus on aggregated analytical workloads rather than rapid operational writes from devices.
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Microsoft Azure Data Fundamentals DP-900
Describe core data concepts
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