急！！ 来一篇关于数据库概述的英语作文

请google scholar 谷歌学术 -- database

或wikipedia 维基百科 -- database

以下为部分节选

A database consists of an organized collection of data for one or more uses, typically in digital form. One way of classifying databases involves the type of their contents, for example: bibliographic, document-text, statistical. Digital databases are managed using database management systems, which store database contents, allowing data creation and maintenance, and search and other access.

Database architecture consists of three levels, external, conceptual and internal. Clearly separating the three levels was a major feature of the relational database model that dominates 21st century databases.

The external level defines how users understand the organization of the data. A single database can have any number of views at the external level. The internal level defines how the data is physically stored and processed by the computing system. Internal architecture is concerned with cost, performance, scalability and other operational matters. The conceptual is a level of indirection between internal and external. It provides a common view of the database that is uncomplicated by details of how the data is stored or managed, and that can unify the various external views into a coherent whole.

guai erzi,die zhao le haojiu cai zhaodao, qisi diele

ni gei die guixia,die jiu yuanliang ni

There has never been a time in human history when we have had access to such vast amounts of information. Everything from our T.V., PC’s, laptops, and smart-phones allow us to surf the web from anywhere at any time. You can find out when your favorite band will be in your city, what time a movie is showing, or find out the latest celebrity gossip. All of that is information… but do you have knowledge?

We are drowning in information but starving for Knowledge,But that is true even for today when we remain more and more informed but so desperately lack in knowledge.

To understand and appreciate this concept we need to firstly acknowledge the difference between Knowledge and Information. We can define them both as related, yet mutually exclusive concepts? I have been thinking with the issue particularly when our lives and livelihood is mostly dependant to information that we get mainly through media. Knowledge consists of specific and unique facts, truths, causes and affects of original sources like judgments, decisions, and methodologies and know how? Knowledge is accumulated and integrated and held over time to handle specific situations and challenges. Information is interpreted, motivated or rather fabricated consists of data mostly organized purposely to describe and tell a particular situation or condition in a desired way.

What did we learn in high school? We learned simple facts. We learned many

things that would never prepare us for the “real” world. So when we were

going through high school, how many of us sought education OUTSIDE of school?

How many watched the news? How many read non fiction books? Not many.

And we graduate. We go to college and often we only learn about subjects in

our major. We still don’t know what happens in the world. Often, way too often,

we are taught our opinions. I can’t say I’m not guilty of it. Someone tells me a

political opinion and maybe I’ll start to agree with them. Sometimes I won’t

check out the matter for myself. But I shouldn’t let others shape my opinion. I

should find the truth for myself.

There is one main thing I want to point out. What we get mostly

from the Internet is data or information, facts and figures. What you are not

getting from the Internet and TV and other such sources is real knowledge.

Knowledge is the end result of you taking all those facts and figures and

putting them together to form some kind of framework or context and

understanding the meaning of it all. While we frequently need just the facts,

more often what we are really seeking is understanding. The knowledge we derive

from those facts and figures, experiences and thoughts of others, and the

context is what we can then beneficially apply to our own situations. What good

is knowledge if we do not apply it for some good?

In any case those of us in the magazine business

seek to provide you with current facts and figures (new products, etc.) but more

importantly new knowledge. We take all that horrendous amount of input from

multiple sources and boil it down, summarize, analyze, explain, provide context,

organize and otherwise process it to give you real knowledge and understanding.

At least we are trying.

So yes, we are adding to the info glut but in a

very positive way. I hope you notice.

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