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Private blockchain as a replicated transactional system shares manycommonalities with distributed database. However, the intimacy between privateblockchain and deterministic database has never been studied. In essence,private blockchain and deterministic database both ensure replica consistencyby determinism. In this paper, we present a comprehensive analysis to uncoverthe connections between private blockchain and deterministic database. Whileprivate blockchains have started to pursue deterministic transaction executionsrecently, deterministic databases have already studied deterministicconcurrency control protocols for almost a decade. This motivates us to proposeHarmony, a novel deterministic concurrency control protocol designed forblockchain use. We use Harmony to build a new relational blockchain, namelyHarmonyBC, which features low abort rates, hotspot resiliency, and inter-blockparallelism, all of which are especially important to disk-oriented blockchain.Empirical results on Smallbank, YCSB, and TPC-C show that HarmonyBC offers 2.0xto 3.5x throughput better than the state-of-the-art private blockchains.

When Private Blockchain Meets Deterministic Database