Compare Dqlite vs. Trusted Control System

Dqlite is a high-speed, embedded SQL database that offers persistent storage and utilizes Raft consensus, making it an ideal choice for resilient IoT and Edge devices. Known as "distributed SQLite," Dqlite expands SQLite's capabilities across multiple machines, ensuring automatic failover and high availability to maintain application uptime. It employs C-Raft, an optimized implementation of Raft in C, which provides exceptional performance in transactional consensus and fault tolerance while maintaining SQLite’s renowned efficiency and compact size. C-Raft is specifically designed to reduce transaction latency, enabling faster operations. Both C-Raft and Dqlite are implemented in C, ensuring they are portable across various platforms. Released under the LGPLv3 license with a static linking exception, it guarantees broad compatibility. The system features a standard CLI pattern for initializing databases and managing the joining or leaving of voting members. It also incorporates minimal, configurable delays for failover alongside automatic leader election processes. Additionally, Dqlite supports a disk-backed database option with in-memory capabilities and adheres to SQLite's transaction protocols. The blend of these features makes Dqlite a powerful solution for modern data storage needs.

The Trusted® fault-tolerant control system is engineered to satisfy a broad spectrum of safety standards. This advanced safety instrumented solution incorporates a triple modular redundant (TMR) architecture that effectively pinpoints the origin of faults. Upon detection of anomalies, the system promptly intervenes to mitigate faults, ensuring compliance with your required safety integrity levels. The TMR configuration employs a majority voting mechanism to ascertain fault sources, whereby random hardware failures lead one of the three control ‘slices’ to behave differently than the others. This voting methodology efficiently captures and documents any discrepancies. In addition, the Trusted TMR system's rapid response to faults reinforces its ability to meet stringent safety integrity criteria. It seamlessly integrates with broader control systems and is compatible with our PlantPAx® platform. Supporting both 24-120V DC and 120V I/O modules, it offers high-density I/O capabilities of up to 40 channels per module. Furthermore, it adheres to safety regulations through partial stroke testing of vital valves, enhancing its reliability in critical applications. This comprehensive design ensures that safety and efficiency remain paramount in operational environments.