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NuDB is a high performance key/value database optimized for insert-only workloads, with these features: * Low memory footprint * Values are immutable * Value sizes from 1 2^48 bytes (281TB) * All keys are the same size * Performance independent of growth * Optimized for concurrent fetch * Key file can be rebuilt if needed * Inserts are atomic and consistent * Data file may be iterated, index rebuilt. * Key and data files may be on different volumes * Hardened against algorithmic complexity attacks * Header-only, nothing to build or link