Cosmos DB
- Partition key determines data distribution; choose high-cardinality fields.
- Consistency levels trade-off between latency and data freshness.
- Change feed provides ordered, persistent log of changes for event-driven patterns.
- Request Units (RU/s) measure throughput; provision at container or database level.
Blob Storage
- Block blobs for files up to 190.7 TiB; append blobs for log-style writes.
- Lifecycle management automates tier transitions (Hot → Cool → Archive → Delete).
- Blob leases provide distributed locking for concurrent access control.
- Blob SDK: BlobServiceClient → BlobContainerClient → BlobClient hierarchy.
Practice Cosmos DB & Blob Storage Questions
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