RocksDB vs Speedb: What are the differences?

## Introduction

RocksDB and Speedb are both high-performance key-value storage engines designed to provide efficient data storage.

1. **Storage Model**: RocksDB is a persistent key-value store whereas Speedb is an in-memory key-value store.
2. **Durability**: RocksDB provides durability by writing data to disk, while Speedb sacrifices durability for speed by keeping data in memory to avoid disk writes.
3. **Performance Impact**: RocksDB may experience latency due to disk writes, while Speedb offers faster performance but at the risk of potential data loss if the system crashes.
4. **Use Cases**: RocksDB is suitable for applications that require durability and can tolerate lower performance, while Speedb is ideal for applications where speed is critical and data loss is acceptable.
5. **Optimization**: RocksDB focuses on persistent storage optimizations, such as reducing disk I/O and maintaining data integrity, while Speedb optimizes for in-memory operations and high-speed data access.
6. **Scalability**: RocksDB can handle larger data sets due to its use of disk storage, while Speedb is limited by available memory but excels at handling smaller, high-speed data sets.

In Summary, RocksDB prioritizes durability and persistent storage, whereas Speedb prioritizes speed and in-memory operations.