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ITSS 4300 Exam 1 questions with complete solutions
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ITSS 4300 Exam 1 questions with complete solutions
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ITSS 4300 Exam 1Data - correct answer ✔✔1. Raw facts
- Have not yet been processed to reveal their meaning to the end user
2. Building blocks of information
3. Data management: generation, storage, and retrieval of data
Information - correct answer ✔✔- Produced by processing raw data to reveal its meaning
- Requires context
- Bedrock of knowledge
- Should be accurate, relevant, and timely to enable good decision making
Database - correct answer ✔✔-Shared, integrated computer structure that stores a collection of:
1. End-user data: raw facts of interest to end user
2. Metadata
-Data about data, which the end-user data are integrated and managed
- Describe data characteristics and relationships
Database management system (DBMS) - correct answer ✔✔- Collection of programs
- Manages the database structure
- Controls access to data stored in the database
Roles of DBMS - correct answer ✔✔- Intermediary between the user and the database
- Enables data to be shared
- Presents the end user with an integrated view of the data
- Receives and translates application requests into operations required to fulfill the requests
- Hides database's internal complexity from the application programs and users
,Why are there so many different types of databases? - correct answer ✔✔- Each database provides
different functions that cater specifically to the people or organizations using it
What are the challenges related to file systems? - correct answer ✔✔- Lengthy development times
- Difficulty of getting quick answers
- Complex system administration
- Lack of security and limited data sharing
- Extensive programming
Structural Independence - correct answer ✔✔- File structure is changed without affecting the
application's ability to access the data
Data Independence - correct answer ✔✔- Data storage characteristics is changed without affecting the
program's ability to access the data
Data Redundancy - correct answer ✔✔1. Unnecessarily storing same data at different places
2. Islands of information: Scattered data locations
- Increases the probability of having different versions of the same data
Problems with data redundancy - correct answer ✔✔- Poor data security
- Data inconsistency
- Increased likelihood of data-entry errors when complex entries are made in different files
- Data anomaly: Develops when not all of the required changes in the redundant data are made
successfully
Types of data anomaly - correct answer ✔✔1. Update
2. Insertion
3. Deletion
, Data Models - correct answer ✔✔- Simple representations of complex real-world data structures
- Useful for supporting a specific problem domain
Importance of Data Models - correct answer ✔✔- Are a communication tool
- Give an overall view of the database
- Organize data for various users
- Are an abstraction for the creation of good database
Building Blocks of Data Models - correct answer ✔✔1. Entity: Unique and distinct object used to collect
and store data
- Attribute: Characteristic of an entity
2. Relationship: Describes an association among entities
- One-to-many (1:M)
- Many-to-many (M:N or M:M)
- One-to-one (1:1)
3. Constraint: Set of rules to ensure data integrity
Business Rules - correct answer ✔✔- brief, precise, and unambiguous description of a policy, procedure,
or principle
- enable defining the basic building blocks
- describe the main and distinguishing characteristics of the data
Why are Business Rules important - correct answer ✔✔1. Help standardize company's view of data
2. Communications tool between users and designers
3. Allow designer to:
- Understand the nature, role, scope of data, and business processes
- Develop appropriate relationship participation rules and constraints
- Create an accurate data model
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