KeyDB is a fully open-source, multithreaded in-memory database that serves as a drop-in replacement for Redis. It offers high throughput and low latency through multithreading and advanced replication. While free to use under a BSD license, commercial alternatives include Redis Enterprise and Amazon ElastiCache, which offer managed services and proprietary features.
Key Features:
- Multithreaded Architecture: KeyDB outperforms Redis on a per-node basis due to its multithreaded design, enabling it to handle over 1 million ops/sec on a single node.
- MVCC Architecture: KeyDB's MVCC implementation allows querying individual database snapshots, avoiding blocking calls like SCAN and KEYS, improving concurrency and performance.
- Active-Replica Nodes: Simplifies high availability setups without requiring sentinel nodes for failover.
- Cross-Region Multi-Master Support: Supports multiple master nodes replicated asynchronously, eliminating the need for sentinel monitoring nodes.
- Subkey EXPIREs: Enables expiration of members within a set, with near real-time active deletion of expired keys.
- TLS Encryption: Offers TLS support with high throughput, leveraging the multithreaded architecture to prevent performance decline.
- ModJS: Allows creating custom commands using KeyDB’s open-source JavaScript module, built on the V8 JIT engine.
Use Cases:
- Caching: Accelerate application performance by caching frequently accessed data in-memory.
- Session Management: Store and manage user session data for web applications.
- Real-time Analytics: Process and analyze real-time data streams for insights.
- Message Queuing: Implement message queues for asynchronous communication between application components.
- Leaderboards and Gaming: Build real-time leaderboards and gaming applications with low-latency data access.
