WGU C175/D426 DATA MANAGEMENT FOUNDATIONS OA EXAM 2024 ACTUAL EXAM 2 LATEST VERSIONS 300 QUESTIONS AND CORRECT DETAILED ANSWERS GRADED A+

WGU C175/D426 DATA MANAGEMENT FOUNDATIONS OA EXAM 2024 ACTUAL EXAM 2 LATEST VERSIONS 300 QUESTIONS AND CORRECT DETAILED ANSWERS GRADED A+ VERSION A. What does modality refer to? How does it appear on ER diagram? - ANSWER- Refers to the MINIMUM number of times an instance in one entity can be associated with instance of another entity (minima) Appears as a 0 or 1 on the relationship line, next to cardinality Define: Referential Integrity - ANSWER- Requires that ALL foreign key values must either be fully NULL or match some primary key value 4 Ways Referential Integrity can be violated: - ANSWER- 1. Primary key is updated 2. Foreign key is updated 3. Row containing primary key is DELETED 4. Row containing foreign key is INSERTED 4 Actions to Correct Referential Integrity Violation: - ANSWER- 1. RESTRICT - rejects an insert, update, or delete 2. SET NULL - sets invalid foreign keys to null 3. SET DEFAULT - sets invalid foreign keys to a default primary value 4. CASCADE - propagates primary key changes to foreign keys What is an important aspect to referential integrity? - ANSWER- reference to data in one relation is based on values in another relation What is a broad definition of data? - ANSWER- Raw facts captured on printed or digital media What are data? - ANSWER- Facts that are collected and stored in a database system What is a determining characteristic of unstructured data? - ANSWER- It does not follow a data model What is true about flat files? - ANSWER- - They contain no internal hierarchical organization How were data retrieved before database management systems? - ANSWER- Sequentially from simple files What is an attribute or group of attributes that uniquely identify a tuple in a relation? - ANSWER- Primary Key What is necessary for a primary key in one relation of a database to match with its corresponding foreign key in another relation of the same database? - ANSWER- A domain of values What uniquely identifies each entity in a collection of entities but is not the primary key? - ANSWER- Alternate Key What is the term for a set of columns in a table that can uniquely identify any record in that table without referring to other data? - ANSWER- Candidate Key What happens to the original data in database indexing? - ANSWER- It is copied to the index Why are indexes created in a physical database design? - ANSWER- To retrieve data DIRECTLY using a pointer Why is an index created on a database column? - ANSWER- To optimize data retrievals Define: Functional Dependency - ANSWER- Each value of a column relates to at MOST one value of another column