Single item size limit of 400KB
5/10 MediumDynamoDB enforces a hard 400KB limit per item, significantly smaller than competing document databases (MongoDB 16MB, Cassandra 2GB). Applications storing large objects must split data across items or use external storage like S3, adding architectural complexity.
Sources
- Planning A Dynamodb...
- When NOT To Use: DynamoDB - Sam Dhar
- 10 DynamoDB Advantages & Disadvantages [2026]
- Amazon DynamoDB Complete Guide 2025: Architecture, Pricing ...
- What are the common challenges faced by developers when ...
- DynamoDB pain points: How to address them and exploring possible alternatives
Collection History
Query: “What are the most common pain points with DynamoDB for developers in 2025?”4/5/2026
The size limit for an item is 400KB, and it is essential to note that the users cannot increase this value in any way. This limitation can be restrictive for applications that need to store large objects or documents within a single item.
Created: 4/5/2026Updated: 4/5/2026