外文翻译---Access2000关系型数据库.doc

access2000关系型数据库原文：access2000 relational databasemembers of the office family, the people of access2000 understanding, often limited in its interface, for the database management function is still at the establishment table, data entry, use form guide reporting wizard, data access2000page wizard and other simple applications. in fact, the functions of the access2000 is a powerful and beyond your imagination. it is released from microsoft access2000functions since most comprehensive, windows and the internet more closely with the database software, is a very powerful, and simple, easy-to-use database management system (dbms) that the database storage, processing and management system. access2000 relational database management system is microsoft office public automation software as an integral part. it can effectively organize, manage and share the information in the database, and database information with the web together. through the internet to share database information with the basic platform. with the development of information technology. information technology platform is often the choice of establishing or re-establishing applications of the key issues, the database is part of the need to make a choice as a key platform. access2000 as a relational database management system small and medium- sized information management system ideal development environment, the current database in the field, there are more and more people use. it is a powerful database management system mis development tools. the database is stored together a collection of relevant data, the data is structured. the database is a data storage and data operation of the tool. the role of the database is to organize and present information, in short, the database is a collection of information. computer database can be divided into two categories: non-relational database (flat-) and relational database (relational). relational database contains a number of data tables, databases containing various parts of the terminology, like records. relational database management system has the technological dominance of the mainstream, but this traditional database management systems by using two-dimensional data model, and there are inherent limitations and restrictions. it difficult to adapt to todays rapidly changing business needs, and the development of new technologies. with the rapid it development, data processing, not only in quantity increasingly demanding, but also the quality of increasingly high demand, database management data has been a fundamental change. this change to the database technology has brought tremendous challenges, object database management is no longer limited to text data and other simple data types. and the description and the need to preserve a lot of complex unstructured multimedia data, and the relationship between the data. furthermore, in the wake of popular websites surge in the number of visits to its own database storage mechanism, a large number of concurrent users to the demand, storage efficiency in the use of space, and data integrity and security, and other aspects of higher demand. these are not traditional relational database, the use of a simple two-dimensional table structure of the meet. access2000 is the relational database development tools, database pooling information for the inquiry, storage and retrieval. access2000 the advantage lies in its ability to use data map or custom windows to collect information. data provides a map similar to the excel spreadsheet, database transparent. in addition, the access2000 allows creation of custom statements to print or export the information in the database. access2000 also provides a data repository. can use desktop database file to extend the database file at the network file server and other network users to share databases? access2000 is a relational database tools, database development, is the most common databases. as noted above, as an access2000 database development possesses many advantages, in a data packet available at the same time facilitate the desktop database and a powerful relational database functions.in access2000, with the user database access permissions are two types: explicit and implicit powers authority. explicit authority is granted a direct user account competence, which is the exclusive use of user accounts, has nothing to do with other users. implicit authority is delegated the authority group account, the user added to the group was given by the groups mandate. if a user with the same time these two powers, the right set of user security database for a visit, then he had such authority is the intersection of the two powers. the access20002000database, the group of users access to the database and the authority set up work, completed only through the administrator. set up the authority include: open/run, read design, design modifications, management, read data, update data insertion and deletion of data. relational database management system inherent limitations in the following three aspects: relational database used in the two-dimensional table data model, can not effectively handle the majority of business applications, typical of multidimensional data. its inevitable result is that in complex ways, the interaction of the dramatic increase in the number of tables, not very good but also to provide realistic simulation of the data model. relational database as they use more data model, which might lead to a massive storage space and wasting a lot of increase, and cause the system to respond to the declining performance. furthermore, the data in reality, there are many types of relational database is not well addressed. static applications such as report generation, and the design of the relational database management system after no response and efficient business processing for the optimization process. the result is often some relational database products, in the gui and web services processing, not achieved the desired results. unless additional hardware investment, but it does not resolve the fundamental problem. relations with the two-dimensional database table data model can deal with the majority of business application of a typical multi- dimensional data, but the results are often the establishment and use of a large amount of data forms, it is difficult to establish a simulation of real-world data model. and the need for data output statements when they, in turn, would have dispersed the large number of two-dimensional data tables. reuse indexing technology linking the table in order to find all the necessary data, this, in turn, is bound to affect the use of the response speed. database various databases is currently the most important and the most popular database. relational database system to support the relational model of database systems, relationships between data model structure, relations operation and integrity constraint set is composed of three parts. office access2000 is the chinese version of one of the components. access2000 to the previous version, the access2000 is not only a more friendly interface, but their functions have also been strengthened, especially network function was improved, internet access2000 so that it more closely connected. access2000 is a small and medium-sized database management system, easy to use, powerful, and other databases have a good interface. access2000 through powerful tool, users can facilitate the use and management of databases, such as the creation and editing of data tables, design and the use of various tools inquiries query operation, design and the use of windows, production and printing statements, the design and use of acer, the design and use of such web pages. may also be used in visual basic6.0a(visual basic6.0 for application)advanced application development procedures. access2000 is a complete database application development tool, the user can design, modify, view a record of the basic data table; in the table data for various screen and query operation; design and use of window to achieve data and operations; data tables can design various print statements; design and use of acer, a series of tables for specific operations. access2000 with a strong operational guide, and to provide users with a rich database table basic template. users only need a simple database operations can be established by using the basic form, form and statements. in access2000, can be set, to alter the basic correlation between the tables, thus achieving a number of related tables in the relationship between the inquiries. access2000-the operation can achieve automation, the operator is more simple and efficient. access2000 to enhance the network function, users can complete the ease of web publication. access2000 can not only deal with their own database files. could also address some other database management software system established by the database files, the ability to distinguish base. foxbase, foxpro, paradox, database formats, such as documents, and support the open database connectivity standard (odbc) sql. access2000 with workstations, servers or databases on the mainframe database interconnected and can be used for building client/server applications of the workstation. and other relational database management systems, access2000 have the following advantages: storage single document. access2000 of a database file contains the database of all data tables, query, windows, all statements, and other data manageable. support for long file names and file name can be added to the blank, documents easily comprehensible search. powerful network function can be transmitted through the network data. easy to use, you do not need to understand the programming language can easily design and development of database applications. can handle a variety of data and information, such as text files and other databases of documents. 译文：access2000关系型数据库在office的家族成员当中，人们最初对于access2000的了解，往往只是局限在它的操作界面中，对于数据库的管理功能仍然只是停留在建立数据表、数据的输入、使用窗体向导、使用报表向导、数据访问的向导等一些相对比较简单的应用上面。其实access2000的功能非常强大，而且超乎你的想象。它是微软自发布access以来功能最全面、与windows和internet结合最密切的数据库软件，是一个功能非常强大，且简单易用的数据库管理系统（dbms），就是对数据库进行存储、管理和处理的系统。access2000数据库管理系统是microsoft公司的office办公自动化软件的一个组成部分。它可以有效地组织、管理和共享数据库的信息，并且将数据库的信息与web结合在一起，并通过internet共享数据信息提供了基础的平台。伴随着信息技术的发展，信息技术平台的选择往往是建立或者是重新建立应用系统的重要问题，而数据库正是它们要做出选择的关键平台。access2000是一种关系型数据库管理系统，是中小型企业管理系统的最理想的开发环境，在当前的数据库领域，已经有越来越多的人在使用。它是一个功能非常强大的数据库管理系统的mis系统开发工具。数据库是存储在一起的相关数据的集合，这些数据是结构化的，数据库是一种用来存储数据并且对数据进行管理的工具。数据库的作用就在于组织和表达信息，简单来说，数据库就是不同信息的集合。计算机的数据库可以分为两大类：非关系型的数据库（flat-file）和关系型的数据库（relational）。关系型的数据库中包含了多个数据表的信息，数据库含有各个不同部分的术语，像记录等。关系型的数据库管理系统曾经处于技术主流而且独领风骚，但是这种传统的数据库管理系统因为采用了两维的数据模型，而且存在着本身固有的约束和限制。难以适应现在迅速变化的业务需求，以及新技术的发展。信息技术的飞速发展，数据处理不仅在数量上需要越来越大，而且在质量上也要求越来越高，数据库所管理的数据已经发生了根本上的变化。这样一个变化给数据库技术带来了巨大的挑战，数据库管理的对象已经不再局限于文本数据等一些简单的数据类型，而是需要描述和保存大量多媒体非结构化的复杂数据，以及数据之间的关系。 另外，随着热门网站访问数量的逐渐增加，对数据库本身的存储机制、大量并发用户的使用需求、存储空间的使用效率、以及数据的完整性和安全性等方面都提出了更高的要求。而这些都不是传统关系数据库中，用二维表简单结构就可以满足需要的。 access2000 就是关系型的数据库开发工具，数据库能够汇集各种信息以供查询、存储和检索。access2000 的优点在于它能使用数据表示图或自定义窗体来收集信息。数据表示图提供了一种类似于 excel 的电子表格，可以使数据一目了然。而且，access2000允许创建自定义的报表用于打印或者是输出数据库中的信息。access2000也提供了数据储存库，可以使用桌面数据库文件把数据库文件置于网络文件服务器中，与其他网络用户共享数据库。access2000 是一种关系型的数据库工具，关系数据库是已经开发的最常用的数据库之一。综上所述，access2000作为关系型的数据库开发具备了很多优点，可以在一个数据包中同时拥有桌面数据库的便利和关系型的数据库的强大功能。在access2000中，用户具有的数据库访问权限有两种类型：显式权限和隐式权限。显式权限是指直接赋予某一用户账号的权限，这是该用户账号专用的，与其他用户无关。隐式权限是指授予组账号的权限，即用户加入到该组中的同时被赋予的组的权限。假如一个用户同时具有上面两种权限，当该用户对设置了安全性的数据库进行访问时，那么，他所具有的权限就是两种权限的交集。在access数据库中，对组和用户访问数据库权限的设置工作，只能通过管理员来完成。设置的权限包括：“打开/运行”，读取设计、修改设计、管理、读取数据，更新数据、插入数据和删除数据。关系型数据库管理系统本身固有的局限性，表现在以下三个方面： 关系数据库所采用的两维表数据模型，不能有效地处理在大多数事务处理应用中，典型存在的多维数据。其不可避免的结果是，在复杂方式下，相互作用表的数量激增，而且还不能很好地提供模拟现实数据关系的模型。关系型的数据库由于它所用数据模型比较多，还可能会造成存储空间的海量增加和大量的浪费，并且还会导致系统的响应性能不断的下降。并且，在现实数据中，有许多类型是关系型的数据库不能较好地处理的。伪静态的应用例如报表的生成，而设计的关系型数据库管理系统，并没有经过针对高效事务处理而进行的优化过程。其结果通常是某些关系型数据库产品，在对gui和web的事务处