共查询到17条相似文献,搜索用时 578 毫秒
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针对移动通信系统中归属位置寄存器(HLR)的业务处理过程对系统的实时性和数据的安全可靠性要求,提出了一种以内存数据库作为主数据库、商用大型数据库作为备份数据库的方案,给出了系统结构和实现方式.采用该方案的HLR系统在实际使用过程中取得了很好的效果. 相似文献
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在高性能商用数据库的管理下,以双服务器外挂同一盘 HA系统模式的结构的HLR数据库系统,有良好的数据安全与完备性,但无法满足HLR系统的实时性要求。为此引入内存缓存以提高系统处理的实时性,但需解决内外存及主备端内存的数据一致。本文分析了HA结构下HLR数据库系统的结构与数据组织,定义了修改图样,提出了实现数据一致的方法。 相似文献
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Informix共享内存虚拟段主要用做内存池以支持会话和线索锭所有的会话都有一个或多个内存池。当数据库服务器需要内存时,它会先查看指定的池。如果池中可用的内存不足以满足请求,则数据库暇务器将从系统池添加内存。如果数据库服务器不能在系统池中找薹4足i够的内存,则它会动态地给虚拟部分分配更多的段。文章就Inforrnix共享内存虚拟段分配进行探讨和分析。 相似文献
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文中对Hibernate检索策略中内存浪费的原因进行了研究,提出了采用查询缓存和集合过滤的方法进行查询优化,降低了访问数据库的频率且避免了在数据查询检索过程中加载不需要的Java对象,从而降低了的内存消耗。最后,通过查询网上购物系统中客户的定单记录试验验证了优化方式的有效性。 相似文献
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归属位置寄存器(HLR)是GSM系统的中央数据库。本文介绍了基于C/S模式的HLR操作维护系统,从运营的角度分析了OMC的业务背景和特点,并根据其特点选择了两层C/S和三层结构混合的实现模式。 相似文献
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数据库系统的性能最终决定数据库的可用性和生命力。大多数数据库系统在运行一段时间后都会存在一定的性能问题,主要涉及数据库硬件、数据库服务器、数据库内存、应用程序、操作系统、数据库参数等方面。本文介绍了数据库性能调整的相关研究背景、论文选题意义以及数据库性能调整与优化概念、性能评价指标以及数据库优化的主要方面;然后,对性能优化进行了研究,结合Oracle9i数据库的使用经验,将SQL语句、Oracle内存分配等方面的性能调整与优化问题作为主要研究内容,给出了针对新疆铁通数据库服务系统性能的调整策略及优化方法。 相似文献
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为了弥补给予固网的林业电子政务难于获取森林资源、地理空间等动态实时数据的不足,本文提出了基于遥感系统、全球定位系统、地理信息系统、林业信息系统、短信息服务的5S技术的林业移动电子政务的基本框架和功能体系。 相似文献
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《Journal of Internet Commerce》2013,12(3):129-146
Abstract Mobile computing technology is now rapidly developing in the area of health care service requiring the use of mobile access to information at remote locations. Mobile information transmission systems distribute data to and from remote basis with information sent back and forth using client/server architecture through any wireless communication media. As such, decision-making for any application domain could then be based on complete knowledge as events occur. This immediate decision-making at a critical time is of particular importance in the case of accidents and/or disaster. However, many application obstacles within wireless computing are yet to be resolved. One major issue is the speed of data retrieval, which directly affects the performance of mobile database applications and can affect the emergency rescue process. In this paper, we investigate a semantic-based transaction management mechanism for mobile emergency rescue support system. We then develop a prototype system by using the mechanism and evaluate the performance of the system. 相似文献
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移动支付是指交易双方为了某种货物或者业务通过移动设备进行商业交易.移动支付系统主体包括客户、商家、银行、移动支付服务提供商、移动运营商以及仲裁机构等.移动支付系统的运行环境十分复杂,在成员构成及运营方式上存在着很大差异.在移动支付系统中,主体较多,而且各主体的目标不尽相同,可能存在利益冲突,因而不同主体之间可能是完全信任、半信任或者完全不信任的关系.移动运营商、商家和移动支付服务提供商是客户对移动支付信任评价的关键.移动终端用户个人因素包括个人信任倾向、认知程度,移动商务网商因素包括卖家可信度、产品和服务质量,移动商务媒介因素包括界面友好程度、操作便捷程度、交互性、移动终端的多样性,移动商务交易环境因素主要包括技术保证、身份识别方式、位置敏感度、第三方认证、政策法规等. 相似文献
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《International journal of injury control and safety promotion》2013,20(1):35-41
In Finland, the Finnish Association for Swimming Instruction and Life Saving (SUH) and Statistics Finland (SF) both provide nationwide data on unintentional drowning. The SUH database relies on rapid reporting from a newspaper clipping service and additional local police information, whereas the SF database relies on the later release of the death certificate information, which is based on extensive medico-legal investigation. The aim of the study was to explore the main differences between the SUH and SF databases for drowning and to evaluate the capacity of the former to characterize drowning events in Finland from 1998 to 2000. Computerized files of death certificates tabulated by SF were linked with the SUH database by deterministic methods. SF and SUH databases allowed the identification of 704 and 567 unintentional drownings, respectively, giving an unintentional drowning rate of 4.5 and 3.6/100?000 per year. Of the 704 drownings described by SF, 418 (59.4%) were also found in the SUH database. The SUH database markedly underreported drowning fatalities in certain settings, such as bath, ditch and swimming pool drownings; fall- and land-traffic-related drownings; and drownings occurring in South Finland. The narrative text of SUH drownings contributed limited information to characterize the drowning events. It was concluded that the newspaper-based SUH data provide more timely data on individual drownings but are not representative of all drownings. Conversely, the SF vital statistics data are more accurate but may take up to 2 years to become available. Both SUH and SF data provide little detailed information on drowning events. A multidisciplinary national surveillance system for drowning is necessary to provide more accurate and timely drowning data, analyse risk factors and design follow-up studies for developing and monitoring prevention strategies. 相似文献