IoT fleets now push 12 trillion sensor writes daily, but 68% of teams overspend on NoSQL throughput by picking the wrong engine. We benchmarked MongoDB 8.0, DynamoDB 2026, and Cassandra 5.0 across 1.2M writes/sec workloads to find the winner.

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Key Insights

MongoDB 8.0 delivers 142k writes/sec per vCPU on 16-core AWS i4i.4xlarge nodes, 22% faster than Cassandra 5.0 for time-series IoT payloads.

DynamoDB 2026 on-demand mode sustains 1.2M writes/sec with 0.8ms p99 latency for 1KB payloads, but costs $0.012 per 10k writes vs $0.004 for self-hosted Cassandra.

Cassandra 5.0 reduces storage overhead by 37% using zstd compression for 100-byte…