Why This Cheat Sheet Matters for AZ-204
This cheat sheet covers the most important Cosmos DB & Blob Storage concepts tested on the AZ-204 (Azure Developer Associate) certification exam. It contains 2 sections with 8 key points that you should memorize before exam day. Use this as a quick-reference guide during your final review sessions.
2Sections
8Key Points
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
Put your knowledge to the test with practice questions.
Azure Quick Reference Tips
Azure services follow consistent naming patterns that help with exam recall. Resource Manager (ARM) templates use JSON, while Bicep provides a cleaner DSL for infrastructure as code. Remember that Azure resources are organised in a hierarchy: Management Groups → Subscriptions → Resource Groups → Resources.