Podcast
Questions and Answers
What is an example of Data Inconsistency?
What is an example of Data Inconsistency?
- Duplicate data in multiple files
- Poor security
- Different values for the same attribute (correct)
- Lack of data sharing
Data redundancy is a problem that occurs when data is stored in a single file.
Data redundancy is a problem that occurs when data is stored in a single file.
False (B)
What is the problem with traditional file environments in terms of data sharing?
What is the problem with traditional file environments in terms of data sharing?
Lack of data sharing and availability
Data redundancy occurs when there is ______________________ data in multiple files.
Data redundancy occurs when there is ______________________ data in multiple files.
Which of the following is a security concern in traditional file environments?
Which of the following is a security concern in traditional file environments?
Data inconsistency is a result of data redundancy.
Data inconsistency is a result of data redundancy.
What is the consequence of poor security in traditional file environments?
What is the consequence of poor security in traditional file environments?
In traditional file environments, data is often stored in multiple files, leading to ______________________.
In traditional file environments, data is often stored in multiple files, leading to ______________________.
Match the following terms with their definitions:
Match the following terms with their definitions:
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Study Notes
Problems With the Traditional File Environment
- Data redundancy: duplicate data in multiple files
- Inconsistency: same data stored in more than one place, different values for the same attribute
- Program-data dependence: coupling of data stored in files and specific programs, changes in programs require changes to data
- Lack of flexibility: information cannot flow freely across functional areas
- Poor security: users may distrust systems with inconsistent data values, high costs for implementing changes
- Lack of data sharing and availability: difficulty in sharing or accessing information timely
Understanding Records, Entities, and Attributes
- Record: describes an entity
- Entity: a person, place, thing, or event on which information is stored and maintained
- Attribute: a characteristic or quality describing a particular entity
- Example: entity COURSE, attributes: Student_ID, Course, Date, Grade
- Specific values that attributes can have are found in the fields of the record describing the entity
Database Management System
- A single human resources database provides many different views of data, depending on the information requirements of the user
- Example: Coding Confusion - different coding systems for the same attribute, e.g., clothing size represented as "extra-large" vs. "XL"
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