SQL to NoSQL: Modernizing data access layer with Amazon DynamoDB

This article provides a comprehensive guide to modernizing a data access layer when migrating from SQL to Amazon DynamoDB, focusing on key design considerations and implementation strategies.

• Redesign entity models with DynamoDB-specific attributes and key prefix configurations
• Create a robust DynamoDB API abstraction layer with features like:
  • Error handling and retries
  • Batch operation management
  • Related entity data loading
  • Response mapping
  • Pagination support
• Handle complex filtering by understanding DynamoDB's two-step query process
• Implement pagination strategies using DynamoDB's `LastEvaluatedKey`
• Manage edge cases and high-volume operations through strategic design patterns
• Use pre-calculated aggregations and de-normalized data for efficient querying

The key takeaway is that successful migration requires a thoughtful approach to redesigning data models and access patterns to leverage DynamoDB's unique capabilities.