关于计算机的英语小短文
关于计算机的英语小短文
计算机出现于20世纪40年代，尽管其发展尚处于萌芽阶段，但现在我们所熟悉的一些计算机词汇在那时已开始产生，比如模拟和数码，比特、数据和存储器， 语言和程序，以及穿孔卡片和输入。小编精心收集了关于计算机的英语小短文，供大家欣赏学习!
关于计算机的英语小短文篇一
DBMS的编排技巧
DBMS(Database Management System) 数据库管理信息系统
DBMS is able to access and retrieve data from nonkey record fields. That is, the DBMS is able to structure and tie together the logically related data from several large files.
DBMS可综合几个文件的数据项以回答用户对信息的查询，这就意味着DBMS能够访问和检索非关键记录字段的数据，即DBMS能够将几个大文件中逻辑相关的数据组织并连接在一起。
Logical Structures. Identifying these logical relationships is a job of the data administrator. A data definition language is used for this purpose. The DBMS may then employ one of the following logical structuring techniques during storage access, and retrieval operations [1]:
逻辑结构。确定这些逻辑关系是数据管理者的任务，由数据定义语言完成。DBMS在存储、访问和检索操作过程中可选用以下逻辑构造技术:
1. List structures. In this logical approach, records are linked together by the use of pointers. A pointer is a data item in one record that identifies the storage location of another logically related record. Records in a customer master file, for example, will contain the name and address of each customer, and each record in this file is identified by an account number. During an accounting period, a customer may buy a number of items on different days. Thus, the company may maintain an invoice file to reflect these transactions.
2. 链表结构。在该逻辑方式中，记录通过指针链接在一起。指针是记录中的一个数据项，它指出另一个逻辑相关的记录的存储位置，例如，顾客主文件中的记录将包含每个顾客的姓名和地址，而且该文件中的每个记录都由一个账号标识。在记账期间，顾客可在不同时间购买许多东西,公司保存一个发票文件以反映这些交易。
3. A list structure could be used in this situation to show the unpaid invoices at any given time. Each record in the customer file would contain a field that would point to the record location of the first invoice for that customer in the invoice file (fig11-1). This invoice record, in turn, would be linked to later invoices for the customer. The last invoice in the chain would be identified by the use of a special character as a pointer.
4. 这种情况下可使用链表结构，以显示给定时间内未支付的发票。顾客文件中的每个记录都包含这样一个字段，该字段指向发票文件(图11-1)中该顾客的第一个发票的记录位置，该发票记录又依次与该顾客的下一个发票记录相连，此链接的最后一个发票记录由一个作为指针的特殊字符标识。
关于计算机的英语小短文篇二
Oracle的数据库管理功能
Oracle includes many features that make the database easier to manage. We've divided the discussion in this section into three categories: Oracle Enterprise Manager, add-on packs, backup and recovery.
Oracle Enterprise Manager
As part of every Database Server, Oracle provides the Oracle Enterprise Manager (EM), a database management tool framework with a graphical interface used to manage database users, instances, and features (such as replication) that can provide additional information about the Oracle environment.
Oracle包括许多使数据库易于管理的功能，分三部分讨论：Oracle企业管理者、附加包、备份和恢复。
Oracle企业管理者
Oracle数据库服务器包括以下部分：Oracle企业管理者(EM)、一个带有图形接口的用于管理数据库用户、实例和提供Oracle环境等附加信息功能 (如：复制) 的数据库管理工具框架。
关于计算机的英语小短文篇三
E-mail地址中的符号@是什么意思
That little "a" with a circle curling around it that is found in email addresses is most commonly referred to as the "at" symbol.
小写字母a外加个圆圈，这一符号常出现在email(电子邮件)地址中，通常是作为"at"(在)的标记。
Surprisingly though, there is no official, universal name for this sign. There are dozens of strange terms to describe the @ symbol.
然而令人感到惊奇的是，这一标记居然没有官方的，通用的名称。有几十个奇怪的术语用来描绘@这一符号。
Before it became the standard symbol for electronic mail, the @ symbol was used to represent the cost or weight of something. For instance, if you purchased 6 apples, you might write it as 6 apples @ class="main">
关于计算机的英语小短文
@这一符号在成为电子邮件的标准符号之前，曾被用来表示物品的单价或质量。例如，你买6只苹果。就可以写成"六只苹果，每只@ class="main">
关于计算机的英语小短文
With the introduction of e-mail came the popularity of the @ symbol. The @ symbol or the "at sign" separates a person's online user name from his mail server address. For instance, joe@uselessknowledge.com. Its widespread use on the Internet made it necessary to put this symbol on keyboards in other countries that have never seen or used the symbol before. As a result, there is really no official name for this symbol.
随着电子邮件的使用，@这一符号越来越普及了。符号@或'at'标记将上网用户的姓名与其邮件的服务器地址分开。例如：joe@uselessknowledge.com。 这一符号在因特网上的广泛使用使得许多以前从未见过或使用过它的国家必须在它们的电脑键盘上加上这一符号键，结果造成这一符号并没有真正的官方名称。
The actual origin of the @ symbol remains an enigma.
@符号的确切起源仍然是谜。
History tells us that the @ symbol stemmed from the tired hands of the medieval monks. During the Middle Ages before the invention of printing presses, every letter of a word had to be painstakingly transcribed by hand for each copy of a published book. The monks that performed these long, tedious copying duties looked for ways to reduce the number of individual strokes per word for common words. Although the word "at" is quite short to begin with, it was a common enough word in texts and documents that medieval monks thought it would be quicker and easier to shorten the word "at" even more. As a result, the monks looped the "t" around the "a" and created it into a circle-eliminating two strokes of the pen.
历史告诉我们，@这一符号起源于中世纪僧侣疲劳的双手。中世纪时印刷机尚未发明，要出版一本书，每一个单词的每一个字母都得用手工辛苦的刻出来。从事这项长时间辛苦誊写刻画的僧侣们就开始寻找减少每一个常用字笔画数的方法。虽然"at"这一单词开始写起来很短，但它在文本和文件中频繁出现。中世纪的僧侣们就想到如果能进一步简化它，就可以写起来更快更容易。结果，僧侣们就在a四周画了一个圈，从而省却了字母"t"的两个笔划。
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