Question 1

Because many physical design and distributed design decisions must be tested on a populated database,these last two phases of the development process are usually divided between systems design and systems implementation.

Accepted Answer

The statement accurately reflects the typical approach to database development, where system design focuses on the conceptual and logical design of the database, while system implementation involves testing and refining the physical design and distributed architecture with real data.

Question 2

The broadest goal of database development is to produce a working database that processes data efficiently and securely.

Accepted Answer

False

Question 3

Achieving good data quality is such an important goal in database design that short and long-term costs are seldom an issue.

Accepted Answer

Achieving good data quality is crucial, but the costs (both short and long-term) are always a consideration. Balancing quality with cost efficiency is a key aspect of database design and management.

Question 4

Conceptual data modeling is especially process-oriented and requires mostly hard skills of the database designer.

Accepted Answer

Conceptual data modeling is primarily focused on understanding and representing the data requirements of an organization from a high-level perspective, emphasizing the organization of data rather than the processes. It requires both hard skills (technical understanding of how data models are constructed) and soft skills (communication, understanding business needs) of the database designer.

Question 5

Due to the high cost costs of developing new systems,a system is seldom changed once it has been implemented.

Accepted Answer

Systems often undergo changes after implementation due to various reasons such as evolving business needs, technological advancements, user feedback, and the need to fix bugs or enhance security.

Question 6

In the traditional life cycle,the systems implementation phase begins when an information system becomes operational.

Accepted Answer

In the traditional life cycle, the systems implementation phase begins before an information system becomes operational, as it involves activities such as acquiring and installing hardware and software, coding, testing, training users, and converting data, leading up to making the system operational.

Question 7

The external schema of a database represents all the requirements and formats of the system,while the conceptual schema deals with the requirements of a particular usage of the database.

Accepted Answer

The external schema of a database represents the views of the database specific to particular users, focusing on how they interact with the database. The conceptual schema, on the other hand, represents the global view of the entire database, detailing all data requirements and relationships for the system as a whole, not just for specific uses.

Question 8

The characteristic of consistency in data quality is achieved when each part of the database has only one meaning.

Accepted Answer

Consistency in data quality refers to the uniformity and reliability of data across different datasets or systems, not just having one meaning.

Question 9

Although establishing a common vocabulary among different parts of an organization is not easy,a database can unify an organization by accomplishing this.

Accepted Answer

A database can provide a common source of information which can establish a common vocabulary and promote consistency across different parts of an organization. This can help unify the organization and improve communication and collaboration among its members.

Question 10

Refinements to the conceptual data model usually occur in the logical database design phase.

Accepted Answer

Refinements and modifications to the conceptual data model are typically performed during the logical database design phase, as this is where the model is transformed into a more detailed representation that can be implemented in a database management system.

Question 11

The role of a database is to provide short-term memory for an information system.

Accepted Answer

The role of a database is to provide long-term storage and retrieval of data for an information system, not just short-term memory.

Question 12

The systems analysis phase produces problem statement and feasibility study,which are inputs into the systems design phase.

Accepted Answer

The answer of The systems analysis phase produces problem statement...

Question 13

An system is a set of unrelated components that work independently to accomplish some objectives.

Accepted Answer

This statement is incorrect. A system is a set of related or interdependent components that work together to accomplish some objectives.

Question 14

The two main activities in the logical database design phase of database development are conversion to tables and data propagation.

Accepted Answer

The two main activities in the logical database design phase are normalization and conversion to tables. Data propagation is not a primary focus at this stage; instead, the emphasis is on structuring data to reduce redundancy and improve data integrity.

Question 15

Indexing on a column or group of columns of a table can improve the performance of update operations in a database,but it slows down the retrieval process of queries.

Accepted Answer

Indexing on a column or group of columns of a table can improve the performance of retrieval (select) operations in a database. However, it can slow down the performance of update and insert operations as the index needs to be updated along with the table.

Question 16

The first two phases of database development are concerned with the information content of the database,while the last two phases are concerned with the efficient implementation of the design.

Accepted Answer

The first two phases of database development, conceptual design and logical design, involve designing the information content of the database. The last two phases, physical design and implementation, focus on the efficient implementation of the design.

Question 17

The conceptual data modeling and logical database design phases are not concerned with the efficient implementation of a database.

Accepted Answer

The conceptual data modeling and logical database design phases focus on designing the structure and relationships of data, not on the efficient implementation of the database. Implementation concerns come later in the physical database design phase.

Question 18

Data placement decisions usually occur in the distributed design phase of database development.

Accepted Answer

The answer of Data placement decisions usually occur in the...

Question 19

Database replication,a technique to improve performance by having multiple copies of the database available to various user groups,is very seldom done in practice because it is too difficult to keep all the copies consistent.

Accepted Answer

Database replication is a commonly used technique to improve performance and availability in modern data management systems. With advancements in technology, it has become easier to keep all the copies consistent through the use of synchronization mechanisms and automated tools, making database replication a viable and popular solution for many organizations.

Question 20

In the traditional systems development life cycle,the boundaries between the various phases are usually well-defined and each phase is completed before the next phase is begun.

Accepted Answer

In practice, the boundaries between phases in the traditional systems development life cycle (SDLC) can often be blurred, with overlap and iteration between phases rather than a strict linear progression.

Quiz 2: Introduction to Database Development