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目的使用量化指标,对比压缩表和非压缩表的查询及更新操作性能进行评测,为大型联机事务处理的数据库应用做技术准备。方法进行实验设计,创建量化平台,分别在压缩与非压缩的数据表上执行特定的数据操纵语句及查询语句,生成结构化查询语言(SQL)数据库执行计划,记录运行时间及结果并进行对比。结果压缩表的空间占用较未压缩表降低1倍多,全表扫描操作的性能提升1倍,而压缩表与未压缩表的数据更新操作和查询操作性能无明显差异。结论联机事务处理的大型应用,可以利用Oracle11g数据库的新特性,采用OLTP表压缩技术,既不影响操作响应时间还可以明显降低磁盘占用空间,从而获得改善数据库性能的好处。 相似文献
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目的解决用数据库存储医学档案信息时的问题。方法运用XML对医疗档案信息进行标记和封装,再结合数据库进行存储。结果运用XML对信息进行标记后可以简化数据存储的复杂性,同时结合数据库进行存储又可以提高检索效率。结论XML和数据库相结合的方法可以实现XML和数据库的优势互补。 相似文献
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目的解决用数据库存储医学档案信息时的问题。方法运用XML对医疗档案信息进行标记和封装,再结合数据库进行存储。结果运用XML对信息进行标记后可以简化数据存储的复杂性,同时结合数据库进行存储又可以提高检索效率。结论XML和数据库相结合的方法可以实现XML和数据库的优势互补。 相似文献
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布式数据库作为现代计算机技术及网络技术发展相结合的产物,在处理及存储数据能力方面占据优势。分布式环境下的数据库架构模式能满足各站点高度自治化的应用需求,但往往忽略了各数据库站点之间的逻辑一致性,导致多个业务信息系统在深层交互及数据共享时出现部分基础数据不相一致,各类统计数据结果大相径庭的情况。数据库同步技术是解决分布式环境下各节点数据库数据不一致的一项关键技术,在信息化建设进程中发挥着举足轻重的作用。该文通过对同步技术的研究与分析,着重讨论MS SQL Server2008事务处理技术在二级医院分布式数据库同步应用上的处理方法及实现效果。 相似文献
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目的:备份“军卫一号”中Oracle数据库中的数据。方法:利用Oracle提供的加密特性,如:数据包加密、透明数据加密、Rman备份加密、数据泵导出加密等,从不同层次对“军卫一号”HIS系统中敏感数据进行加密。结果:这些加密方法有效保护了Oracle数据库中的联机数据和备份数据。结论:方法安全、易于实现,可根据系统的安全需要选择多种方式加密数据库中的数据。 相似文献
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目的 :对Oracle数据库的Data Guard机制进行了研究,用于"军卫一号"数据库的异地容灾。方法 :采用Oracle数据库的Data Guard机制,建立"军卫一号"数据库的主库和备库。主库设置为强制记录日志模式,备库增添4个联机日志文件并启动到MOUNT状态。在"军卫一号"系统中进行操作,主库将事务记录在数据库联机日志文件中,实时或定时传送给备库,备库通过增添的4个联机日志文件接收,并读取数据库日志文件中主库提交的事务,依据数据重做机制,在备库中重新执行。结果:"军卫一号"数据库主库出现故障,引起异常宕机无法恢复,备库切换成主库模式,宕机重启,"军卫一号"系统可正常运行,数据零丢失。结论:该方案实现"军卫一号"数据库实时同步备份,数据零丢失,操作简单,数据库容灾恢复时间短,可行性强,恢复后的数据库经严密测试,系统运行平稳。 相似文献
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目的 :对Oracle数据库的Data Guard机制进行了研究,用于"军卫一号"数据库的异地容灾。方法 :采用Oracle数据库的Data Guard机制,建立"军卫一号"数据库的主库和备库。主库设置为强制记录日志模式,备库增添4个联机日志文件并启动到MOUNT状态。在"军卫一号"系统中进行操作,主库将事务记录在数据库联机日志文件中,实时或定时传送给备库,备库通过增添的4个联机日志文件接收,并读取数据库日志文件中主库提交的事务,依据数据重做机制,在备库中重新执行。结果:"军卫一号"数据库主库出现故障,引起异常宕机无法恢复,备库切换成主库模式,宕机重启,"军卫一号"系统可正常运行,数据零丢失。结论:该方案实现"军卫一号"数据库实时同步备份,数据零丢失,操作简单,数据库容灾恢复时间短,可行性强,恢复后的数据库经严密测试,系统运行平稳。 相似文献
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病理信息系统将病理检查的病理图像、报告数据采集、保存到网络上的数据库中,在网上进行病理涂片图像的判读、书写诊断报告,进行病理检查流程的环节控制和质量控制,它与医院HIS系统的数据交换是系统成功应用的前提之一。本文采用数据库触发器、同步程序实现数据间交换,前端程序同时连接HIS和病理信息系统实现数据实时交换,满足了检查申请单、费用、检查报告等数据在病理信息系统与医院HIS系统中的共享数据要求,实现了两个系统的无缝连接,使得病理信息系统在医院顺利投入运行。 相似文献
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心电信息系统将病人检查的心电数据采集、保存到网络上的数据库中,在网上进行心电数据分析、书写报告及心电数据的波形回放,它与医院HIS系统的数据交换是系统成功应用的前提。本文采用存储过程、触发器、数据库链接实现数据库间的数据交换,该方法在交换时机选择、交换内容收集、语义转换方面具有较强的适应性。在心电信息系统与医院HIS系统的数据交换中应用该方法,实现了两个系统的无缝联接,使得心电信息系统在医院的应用受到广泛欢迎。 相似文献
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CDC WONDER: a comprehensive on-line public health information system of the Centers for Disease Control and Prevention. 总被引:9,自引:7,他引:2 下载免费PDF全文
OBJECTIVES. CDC WONDER, a comprehensive on-line public health information system of the Centers for Disease Control and Prevention (CDC), was developed to place timely, action-oriented information in the hands of public health professionals. METHODS. A unified system was developed de novo to be used for and to evolve along with public health. All data are stored and updated on the CDC mainframe. RESULTS. CDC WONDER provides menu-driven access to 24 databases with information on mortality, hospital discharges, cancer incidence, notifiable diseases, acquired immunodeficiency syndrome, the Morbidity and Mortality Weekly Report, etc.; each database has on-line documentation. Results can be tabulated and graphed, and there is full-text searching of textual databases. Non-CDC staff have access via telephone connection. From August 1991 through June 1992, system databases were accessed 10,698 times, and there were 842 users (mean of 97 new users per month). CONCLUSIONS. CDC WONDER has shown that it is possible to build a large, on-line database of scientific data for public health professionals. CDC WONDER provides a common foundation from which to build information-based public health plans and policy and could help strengthen the public health system. 相似文献
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《Health Policy and Technology》2014,3(1):13-25
As the cost of health care rises governments everywhere are examining how on-line services can replace or augment face-to-face services. Consequently, many health bodies are establishing on-line health forums where patients can share ideas with, or solicit information from, both other patients and health professionals. In the wake of this trend, many on-line forums have arisen which do not have the imprimatur of official government services but are run and managed by private individuals sharing experiences outside of the patient-clinician channel. This phenomenon creates risks and challenges for users who need to evaluate the credibility of unknown and often anonymous contributors to these forums. This paper examines how users assess the credibility of the information in these forums. Five criteria were discovered in the first stage of the work. We then quantitatively tested the relationship between those criteria based on two types of information. Our analysis shows that different criteria are used by participants in online health forums for scientific information and experiential information. We used these novel findings to develop a model for how information credibility is assessed in online health forums. These findings provide important lessons for health promotion bodies considering how to encourage the sharing of valuable health information on-line as well as guidelines for improved tools for health self-management. 相似文献
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介绍了一种基于B/S的心电信号网络分析服务系统。该系统整合了网络、数据库与心电信号分析工具的优势,可为用户提供在线的心电信号分析服务。用户只要掌握常规浏览器操作即可对数据库中或用户采集的心电实验数据进行分析处理,并将结果进行实时显示。 相似文献
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A. WISE 《Nutrition Bulletin》1989,14(3):174-181
Computers can be used for a wide range of educational and research purposes in addition to the well-known function as a rapid means of calculating nutrient intakes. The paper describes an example whereby data are entered using an interactive program which is operated by the use of self-explanatory commands and provides on-line help facilities. When data have been checked and basic nutritional calculations performed, the data can be stored and used for the analysis of the frequency and distribution of foods and meals, the variety of the diet and the food habits of different groups of the population. The information gathered can be useful in the construction of nutrition education programmes and will even give dietary advice. 相似文献
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Kirschenbaum IH 《Journal of healthcare resource management》1995,13(10):17-8, 23
Surgical scheduling and data collection is a field that has a long history as well as a bright future. Historically, surgical cases have always involved some amount of data collection. Surgical cases are scheduled and then reviewed. The classic method, that large black surgical log, actually still exists in many hospitals. In fact, there is nothing new about the recording or reporting of surgical cases. If we only needed to record the information and produce a variety of reports on the data, then modern electronic technology would function as a glorified fast index card box--or, in computer database terms, a simple flat file database. But, this is not the future of technology in surgical case management. This article makes the general case for integrating surgical data systems. Instead of reviewing specific software, it essentially addresses the issues of strategic planning related to this important aspect of medical information systems. 相似文献