Different NoSQL databases offer different consistency models:
DynamoDB: Eventually consistent by default. Strongly consistent reads cost x. Global tables are eventually consistent across regions.
Cassandra: Tunable. Configure read/write consistency levels per operation. QUORUM ensures majority agreement.
MongoDB: Configurable write concern and read preference. Replica set primary handles writes. Secondaries can serve reads.
Pattern: Start with eventual consistency. Add strong consistency where business logic requires it. Most reads don't need it.