WGU D426 V2 Practice Questions and Answers 2024

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WGU D426 V2 Practice Questions and Answers 2024

1. The relationship (within the relation) that describes how the value of one attribute may be used to find the value of another attribute.: Functional Depen- dency 2. An attribute that can be used to find the value of another attribute in the relation.: Determinant 3. Value can be used to find the value of every other non-key attribute in the table. Unique and minimal.: Candidate Key 4. Define & manage database structures: DDL 5. Adding, deleting, and modifying data - Manipulates data stored in a data- base.: DML 6. Used to create user accounts, manage permissions and access.: DCL 7. Includes CREATE, DROP, ALTER,TRUNCATE, RENAME: DDL 8. A view created and stored on the database. Underlying data is changed and also updated in this view. Uses memory space.: Materialized View 9. Not stored in memory. Only computed when used or accessed.: Virtual View 10. The data about the data. Describes elements such as columns, names, and data type.: Metadata 11. Ordered collection of elements in parentheses.: Tuple 12. % of table rows selected by a query: Hit Ration 13. Reads blocks directly, without accessing an index.: Table Scan 14. Reads index blocks sequentially in order to locate the needed table blocks.: Index Scan 15. Database repeatedly splits the index in two until it finds a match.: Binary Search 16. Database object that maps one or more tables to a single file.: Tablespace 17. Specifies tables, columns, and keys. Implements database requirements in a specific database system. Also called a schema.: Logical Design 18. Specifies indexes, table structures, and partitions. Specifies how tables are organized on storage media.: Physical Design 19. Components of a computer system and the relationships between compo- nents.: Architecture 20. Interact directly with database users and administrators and send queries to the query processor. Includes Connectors & APIs, Workbench, and utility programs.: Tools 21. Interprets queries. Compiles queries into low-level instructions for the storage engine. Creates a plan to modify the database or retrieve data, and returns query results to the application.: Query Processor 22. Link between tools and query processor: Connection

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