FilterExpressions inefficiency and scan operation misuse

6/10 Medium

Using FilterExpressions in DynamoDB first retrieves matching items then applies filtering, making it inefficient. Developers often abuse the Scan method for querying instead of using proper indexes, resulting in high costs and poor performance.

DynamoDB
Category
performance
Workaround
solid
Stage
build
Freshness
persistent
Scope
single_lib
Recurring
Yes

Sources

Collection History

Query: “What are the most common pain points with DynamoDB for developers in 2025?”4/5/2026

Using FilterExpressions has a caveat — when filtering to narrow down results, DynamoDB first retrieves matching items and then applies the filter afterward. Instead of filters, you should be relying on secondary indexes for filtering data. The Scan method lets you have unbounded querying and filtering capabilities. However, most of the time you don't want to use it.

Created: 4/5/2026Updated: 4/5/2026