Amazon DynamoDB mindmap

Amazon DynamoDB

Serverless NoSQL database with single-digit millisecond performance at any scale

• Data model
  • Tables, items and attributes: Items up to 400 KB
  • Partition key: Spreads data across partitions; choose high cardinality
  • Sort key: Orders items within a partition for range queries
  • Query and Scan: Query uses keys; Scan reads the whole table
• Capacity modes
  • On-demand: Pay per request; no capacity planning
  • Provisioned: Set read and write capacity units, with auto scaling
• Indexes
  • Global secondary indexes: Different partition and sort keys; eventually consistent
  • Local secondary indexes: Same partition key, different sort key; created with the table
• Consistency and transactions
  • Eventually consistent reads: The default, half the cost of strongly consistent reads
  • Strongly consistent reads: Return the latest write
  • Transactions: All-or-nothing changes across items and tables
• Global and streaming
  • Global tables: Multi-Region, multi-active replication
  • DynamoDB Streams: Ordered item changes for 24 hours
  • Kinesis Data Streams: Longer retention and more consumers
  • Time to Live: Delete expired items at no write cost
• Performance
  • DynamoDB Accelerator (DAX): In-memory cache with microsecond reads
  • Adaptive capacity: Absorbs uneven traffic across partitions
• Backup and recovery
  • Point-in-time recovery: Restore to any second in the recovery window, 1 to 35 days
  • On-demand backups: Full backups for long-term retention
• Security
  • Encryption at rest: Always on; AWS owned, AWS managed or customer managed keys
  • Fine-grained access: IAM conditions on keys and attributes
  • VPC endpoints: Reach DynamoDB from a VPC through endpoints