Developing Solutions for Microsoft Azure (AZ-204) Practice Exam

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What are the two components of a partition key in Azure Cosmos DB?

Key path, synthetic key
Key path, key value
Key value, item ID
Key path, partition ID

The correct answer is: Key path, key value

In Azure Cosmos DB, the partition key is fundamental to how data is distributed and accessed within the database. The two components associated with a partition key are the key path and key value. The key path refers to the location within the document where the partition key resides. This allows Azure Cosmos DB to identify which property in a document should be used as the partition key. The key value, on the other hand, represents the actual value of the partition key for a given item. When a document is written to the database, the key value determines the specific partition to which that document is assigned. Each document's partition key value contributes to efficient scaling and performance across distributed systems by ensuring that related data is often stored together. Understanding these two components is essential for effectively modeling data in Azure Cosmos DB, as they influence data distribution, throughput, and performance. This knowledge enables developers to optimize their applications and make informed decisions on partitioning strategies based on access patterns and scalability requirements.