Data consistency
By eliminating or controlling redundancy, we reduce the risk of inconsistencies occurring.
（通过消除或者控制数据冗余，我们减少了不一致发生的风险。）
If a data item is stored only once in the database; any update to its value has to be performed only once
and the new value is available immediately to all users.
(在数据库中，数据项目如果仅存一次，对这个什的更新只能执行一次，新的更新值立即对所有用户都有用。)
If a data item is stored more than once and system is aware of this，
the system can ensure that all copies of the item are kept consistent.
(如果被存储的数据项多于一次，并且系统意识到这一点,系统可能确保所有该项目的副本保持一致。)
Unfortunately, many of today's DBMSs do not automatically ensure this type of consistency.
(不幸的是，今天，许多的DBMS不能自动确保这种类型的一致性。)
More information from the same amount of data
(从同样多的数据量提取更多的信息)

With the integration of the operation data, it may be possible for the organization to derive additional information
from the same data.
在操作数的整合下，从同一数据里，公司可能提取额外的信息。
derive/dir'aiv/ (derives deriving derived)
1. [verb] v n from n/-ing
If you derive something such as pleasure or benefit from a person or from something, you get it from them. (Formal)
如果你获得了某些事情，比如快乐和好处从一个人或者一些事情，你得到它从他们中间。
Mr. Ying is one of those happy people who derive pleasure from helping others.
银先是喜欢帮助人并且从中获得快乐人群中的一员。
2.[verb] be v-ed from n, v from n
If you say that something such as a word or feeling derives or is derived from something else,
you mean that it comes from that thing.
如果你说某些事情，诸如一个单词或工种感情，来源于某些其它事情，你的意思是，它来自那件事情。
Anna's strength is derived from her parents and her sisters...
The word Easter derives from Eostre, the pagan goddess of spring.
复活节这个单词来原于奥斯塔， 春天的女神。
For example, in the file-based system illustrated in Figure 1.5, the Contracts Department does not know who owns a leased property.
例如， 在图1.5中，基于文件系统的实例， 合同部门并不知道谁有租赁物业。

lease /li:s/ (leases leasing leased)
1. [N-count]  A lease is a legal agreement by which the owner of a building, a piece of land, or something such as a car allows someone else to use it for
a period of time in return for money.
He took up a 10 year lease on the house at Rossie Priory.
(他签约了10年的租期，在Rossie Priory)
2.[verb]V n, V n to n,  V n n;
If you lease property or something such as a car from someone or if they lease it to you, they allow you to use it in return for regular payments of money.
如果你租赁物业或者一些事情，诸如此类，来自某人的汽车，或者，如果他们把它租给你，他们允许你使用它，返回正规的付款。
He will need more grazing land and perhaps La Prade could lease him a few acres.
(他将需要更多的牧场， 也许拉.普拉德可能租给他一些。)
3. [Phrase] Phr after v  If you say that someone or something has been given a new lease of life, you are emphasizing that
they are much more likely or successful than they have been in the past.
如果说某人或者某事已经被赋予了新生，你是强调，他们是更可能或者更成功比起他们曾经。
The operation has given me a new lease of life.
操作给他的生命赋予了新生。

Similarly, Sale Department has asno knowledge of lease details.
相似，销售部门没有租赁明细。
When we integrate these file, the Contract Department has access to owner details and the Sales Department has access to lease details.
当我们整合这些文件时，合同部门录入用户的详细信息，销售部门录入租赁详细信息。

We may now be able to derive more information from the same amount of data. 
我们可以从相同的数据量导出更多的信息。