Research On Semantic-Based Blockchain Query Optimization

Centralized databases in traditional applications face issues such as low credibility and vulnerability to data tampering,so the decentralized,immutable,and traceable characteristics of blockchain technology make it a powerful tool to solve these problems.Currently,there are limitations and challenges in blockchain query processing.The query performance and query types of existing blockchain systems are relatively limited.Specifically,most existing blockchain systems store data in key-value databases or file systems that lack semantic descriptions,leading to insufficient query semantics and inability to model complex queries.In addition,existing blockchain systems have insufficient query performance and it is difficult to perform query integrity verification.To address these issues,this thesis proposes two solutions for improving blockchain query processing: an index-based conventional blockchain query processing solution and a chain cluster blockchain query optimization solution based on semantic single-chain decomposition.In the first part,four index structures are proposed,which are used to optimize different types of queries.These index structures are used together to optimize the query processing process,significantly reducing query response time.In the second part,the chain cluster blockchain query optimization solution based on semantic singlechain decomposition is proposed.This solution optimizes the blockchain storage of semantic data structures and solves issues of weak semantic structure,high semantic coupling,slow query speed,and difficult verification in existing blockchain systems.Specifically,the logical and physical structure and organization of blockchain are defined,and various specific index implementation methods under the chain cluster optimization mode are provided,as well as query verification methods,to ensure the efficiency of blockchain semantic storage and query functions,and to provide query verification functions to ensure query data integrity.Additionally,the feasibility and effectiveness of these solutions are verified through experiments conducted in practical application scenarios.These solutions can provide important support for the practical application of blockchain technology in various scenarios.