What are the differences between VoltDB and Redis?

1. Data model:

1. VoltDB is a relational database that supports SQL queries and ACID transactions, using a tabular data model to store data.
2. Redis is an in-memory database based on key-value pairs that supports various data structures like strings, lists, and sets.

1. Memory management:

1. VoltDB persists data to disk, but data remains stored in memory for fast access.
2. Redis stores data entirely in memory and can persist it on disk through a persistence mechanism.

1. Distributed processing:

1. VoltDB supports a distributed architecture, allowing for horizontal scaling across multiple nodes.
2. Redis also supports a distributed architecture, allowing for horizontal scaling through cluster deployment.

1. Data processing ability:

1. VoltDB is ideal for scenarios that require high throughput and low latency, such as financial transactions and real-time analytics.
2. Redis is suitable for scenarios requiring fast read and write data such as caching, session storage, and message queues.

Generally speaking, VoltDB is more suitable for scenarios requiring strong consistency and high performance in relational data storage, while Redis is more suitable for scenarios requiring fast read/write and support for multiple data structures.