Trắc Nghiệm UML potx

Trắc Nghiệm UML - Bài 63 ( English )
Bài trắc nghiệm UML sau đây sẽ giúp các bạn củng cố thêm kiến thức về quá trình áp dụng
một chuỗi luật vào 1 mô hình dữ liệu lôgic, cách để giảm thời gian truy nhập,cũng như quá
trình tăng tốc độ truy nhập dữ liệu
Số câu: 10
Điểm số cho mỗi câu: 1
Đánh dấu đáp án đúng sai: Đúng: Sai:
Tỉ lệ yêu cầu đạt: 75 %
Thời gian làm bài: 10 Phút. Thời gian còn lại: 09:05
1 - Normalization is a process that applies a series of rules to a logical data model to
determine how well the model is formed.
[a] True
[b] False
2 - Denormalization of a data model reduces the number of joins that must be
performed in a query, which increases the speed of data access.
[a] True
[b] False
3 - IBM DB2, Jasmine, and Oracle are examples of end-user database management
systems that can manage huge volumes of data and support applications that run an
entire company.
[a] True
[b] False
4 - A file contains an electronic list of information that is formatted for a particular
transaction, and the information is changed and manipulated by programs that are
written for those purposes.
[a] True
[b] False
5 - Look-up files store core information that is important to the business and to the
application, and are usually kept for long periods of time with new records appended to
the end of the file.
[a] True

[b] False
6 - The most efficient tables in a relational database in terms of storage space have no
redundant data and very few null values because the presence of these suggest that
space is being wasted, and more data to store means higher data storage hardware costs
[a] True
[b] False
7 - Optimization is a process whereby a series of rules are applied to a logical data
model to determine how well-formed it is; these rules help analysts identify entities that
are not represented correctly.
[a] True
[b] False
8 - There are several techniques that the project team can use to try to speed up access
to the data: denormalization, clustering, and indexing.
[a] True
[b] False
9 - Null values in a database are easy to interpret.
[a] True
[b] False
10 - Clustering similar records together is one way of reducing access time.
[a] True
[b] False

Làm l?i

Solutions!
Question 1 a
Question 2 a
Question 3 b
Question 4 a
Question 5 b

Question 6 a
Question 7 b
Question 8 a
Question 9 b
Question 10 a