嵌入式数据库技术研究

嵌入式数据库技术研究ResearchTechnologyofEmbeddedDatabaseSystemI摘要随着移动计算时代的到来，嵌入式操作系统对移动数据库系统的需求为数据库技术开辟了新的发展空间。嵌入式数据库技术目前已经从研究领域逐步走向了广泛的应用领域。随着移动终端的普及，人们对移动数据的实时处理和管理要求不断提高，嵌入式数据库也越来越显示出其优越性。本文阐述了嵌入式系统和嵌入式数据库系统在系统功能、性能、体系结构等方面的特点，同时详细分析了系统的实现过程。并着重对嵌入式数据库中的几项关键技术进行了分析、研究。首先，实现了嵌入式数据库的基本功能。其次对嵌入式数据库系统中的存储管理、查询管理和数据同步复制等几项关键技术进行了探究，经过大量的资料查阅、分析和探究，找出了影响系统性能的关键所在：(1)外存I/O的次数；(2)重复解析SQL语句的次数。对以上问题进行了深入分析和研究。关键词：嵌入式系统，嵌入式数据库，存储管理，查询管理；IIAbstractWhenmobilecomputingagecomes,demandforembeddedoperatingsystemtomobiledatabasesystemopensupanewfieldindatabasetechnology.Atpresent,technologyinembeddeddatabasesystemhasdevelopedfromresearchstageintoapplication.Asmobileterminalbecomeswidespread,real-timeprocessandmanagementinthisareaenablesembeddeddatabasesystemtoturnouttobemorepowerful.Thispaperexplainsthefunctions,performance,andstructureoftheembeddeddatabasesystem.Itsimplementationisanalyzed.Andthekeytechniquesoftheembeddeddatabasesystemarepinpointed.Firstofall,thebasicfunctionoftheembeddeddatabasesystemisimplemented.Secondly,thekeytechniquesoftheembeddeddatabasesysteminthisexperiment,suchasmemorizermanagement,querymanagementanddatasynchronizationreplication,arefurtherresearched.Themassivematerialsconsult,theanalysisandtheresearchhadbeencarriedonandthekeyeffectsontheperformanceofthesystemhadbeendiscovered:(1)numbersofI/Oofexternalstorage;(2)numbersofrepetitionofparseSQL.Throughtheanalysisandtheresearchonthequestionsabove,thispaperproposesandtestifiestheeffectivesolutionsonbasisofexperiment.Keywords:EmbeddedSystem，EmbeddedDatabaseSystem，MemorizerManagement，QueryManagement；III目录第一章引言................................................................................................................11.1选题背景........................................................................................................11.2研究目的和意义............................................................................................11.3嵌入式数据库系统的发展现状和应用前景................................................2第二章嵌入式系统....................................................................................................32.1嵌入式系统概述和特点................................................................................32.1.1嵌入式系统概述.................................................................................32.1.2嵌入式系统的发展.............................................................................32.1.3嵌入式系统的特点.............................................................................42.2嵌入式操作系统............................................................................................52.3嵌入式应用软件............................................................................................6第三章嵌入式数据库................................................................................................73.1嵌入式数据库概述........................................................................................73.2嵌入式数据库的特点....................................................................................73.3嵌入式数据库的体系结构............................................................................93.4嵌入式数据库的关键技术..........................................................................103.5嵌入式数据库的主流产品..........................................................................113.5.1国外主流产品...................................................................................113.5.2国内主流产品...................................................................................12第四章嵌入式数据库的实现技术..........................................................................134.1嵌入式数据库的存储管理..........................................................................134.1.1存储数据模型...................................................................................134.1.2数据的存储组织...............................................................................134.1.3数据存取性能优化...........................................................................154.2词法、语法分析及预处理技术..................................................................164.2.1词法分析...........................................................................................174.2.2语法分析...........................................................................................194.2.3预处理技术.......................................................................................22IV4.3嵌入式数据库的查询管理..........................................................................234.3.1查询语句的执行...............................................................................244.3.2索引结构的设计与实现...................................................................244.3.3查询机制的优化...............................................................................274.3.4嵌入式数据库的基本操作...............................................................28第五章结束语..........................................................................................................29致谢...............................................................................................错误!未定义书签。参考文献.......................................................