NuoDB vs VoltDB: What are the differences?

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1. Database Architecture: NuoDB is a distributed SQL database management system designed for high availability and performance by distributing data across multiple hosts, while VoltDB is an in-memory database management system that uses a shared nothing architecture to achieve high throughput and low latency.
2. Consistency Model: NuoDB follows an ACID-compliant consistency model, ensuring that transactions are processed reliably and consistently, while VoltDB employs an in-memory, lock-free architecture for transaction processing to achieve high concurrency and low latency.
3. Scaling Capabilities: NuoDB allows for elastic scalability by adding more nodes to the database to handle increased workloads, while VoltDB's scaling is limited by the size of the cluster due to its shared-nothing architecture.
4. Data Durability: NuoDB supports durable transactions with multiple layers of redundancy to ensure data persistence, while VoltDB relies on in-memory processing and replication to achieve high availability at the expense of durability.
5. Query Processing: NuoDB uses a distributed query engine to parallelize query processing across multiple hosts for improved performance, while VoltDB executes queries in parallel on individual partitions to optimize resource utilization and minimize latency.
6. Use Cases: NuoDB is well-suited for cloud-native applications that require horizontal scalability and fault tolerance, while VoltDB is ideal for real-time applications that demand high throughput and low latency processing.

In Summary, NuoDB and VoltDB differ in their database architecture, consistency model, scaling capabilities, data durability, query processing, and use cases.