WGU D426 V2 Actual Exam | 160 Questions and Answers 2024 Graded A.
WGU D426 V2 Actual Exam | 160 Questions and Answers 2024 Graded A. The relationship (within the relation) that describes how the value of one attribute may be used to find the value of another attribute. Functional Dependency An attribute that can be used to find the value of another attribute in the relation. Determinant Value can be used to find the value of every other non-key attribute in the table. Unique and minimal. Candidate Key Define & manage database structures DDL Adding, deleting, and modifying data - Manipulates data stored in a database. DML Used to create user accounts, manage permissions and access. WGU D426 V2 Actual Exam | 160 Questions and Answers 2024 Graded A. DCL Includes CREATE, DROP, ALTER, TRUNCATE, RENAME DDL A view created and stored on the database. Underlying data is changed and also updated in this view. Uses memory space. Materialized View Not stored in memory. Only computed when used or accessed. Virtual View The data about the data. Describes elements such as columns, names, and data type. Metadata Ordered collection of elements in parentheses. Tuple % of table rows selected by a query Hit Ration Reads blocks directly, without accessing an index. Table Scan Reads index blocks sequentially in order to locate the needed table blocks. Index Scan Database repeatedly splits the index in two until it finds a match. Binary Search .
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