MongoDB vs DynamoDB vs Cassandra UK NoSQL (2025)
For most UK applications use PostgreSQL. If you genuinely need NoSQL: DynamoDB for key-value and TTL. MongoDB Atlas for document data. Cassandra for very high write throughput — rarely right for UK SME. NoSQL is frequently chosen on trend rather than genuine need. Honest UK assessment:
| Factor | PostgreSQL | DynamoDB | MongoDB Atlas |
|---|---|---|---|
| Cyber Essentials patching | RDS managed by AWS | AWS managed — no obligation | Atlas managed — no obligation |
| UK GDPR Row Level Security | Native RLS — strongest | IAM policies only | Collection-level only |
| UK data residency | eu-west-2 | eu-west-2 | EU region available |
| ACID transactions | Full ACID always | Single-table only | Multi-document since v4 |
| SQL query support | Full SQL | No — partition key | No — aggregation only |
| NHS/FCA audit familiarity | High — SQL standard | Medium | Medium |
| ClickMasters default | All applications | Key-value and TTL only | Document CMS only |
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