WGU D426 DATA MANAGEMENT FOUNDATIONS FINAL EXAM accurate 2025 update. (100% complete questions and answers).

WGU D426 DATA MANAGEMENT FOUNDATIONS FINAL EXAM accurate 2025 update. (100% complete questions and answers). Architecture - ANSWER-Describes the internal components AND the relationships between components. Query Processor - ANSWER-Interprets queries, creates a plan to modify the database or retrieve the data, and returns query results to the application. Performs query optimization. Query Optimization - ANSWER-Ensures efficient instructions are executed on the data from the Query Processor. Storage Manager - ANSWER-Translates the query processor instructions into low- level file-system commands that modify OR retrieve data. Uses indexes to quickly locate data. Transaction Manager - ANSWER-Ensures transactions are properly executed. Prevents conflicts between concurrent transactions. Also restores the database to a consistent state in the event of a failure. Log - ANSWER-A file containing a complete record of ALL inserts, updates, and deletes processed by the database. The records can be used to restore a database. Catalog/Data Dictionary/Repository - ANSWER-A directory of tables, columns, indexes, and other database objects. Relational Database - ANSWER-Stores data in tables, columns, and rows, SIMILAR to a spreadsheet. It also supports SQL. Made up of relations. NoSQL - ANSWER-A new generation of DBMS that is NOT based on the traditional relational database model. CRUD - ANSWER-Acronym for actions that can be performed by a query. SQL Statement - ANSWER-A database command such as a query that inserts, retrieves, updates, or deletes data. Composed of one or more clauses. INSERT - ANSWER-Inserts rows into a table. SELECT - ANSWER-Retrieves data from a table. UPDATE - ANSWER-Modifies data in a table. DELETE - ANSWER-Deletes rows from a table. CREATE TABLE - ANSWER-Creates a new table by specifying the table and column names. Data Type - ANSWER-Indicates the TYPE of data that can be stored in a field of a column. Data Independence - ANSWER-Allows database administrators to improve query performance by changing the organization of data on storage devices, without affecting query results or changes to programs. Database Design - ANSWER-A specification of database objects such as tables, columns data types, and indexes. Also refers to the process used to develop the specifications. Metadata - ANSWER-Data ABOUT the database, such as column names and the number of rows in each table. Database Design - Analysis - ANSWER-This phase specifies database requirements without regard to a specific database system. May also be referred to as conceptual design, entity-relationship modeling, and requirements definition. Database Design - Logical Design - ANSWER-This phase implements database requirements in a specific database system. Depicted in a table diagram. Database Design - Physical Design - ANSWER-This phase adds indexes and specifies HOW tables are organized on storage media. Specified with SQL statements. Key - ANSWER-A column used to identify individual rows of a table. Used to refer to only one specific row or record. Application Programming Language (API) - ANSWER-A library of procedures or classes that links a host programming language to a database. Schema - ANSWER-The structure of tables in the database. Foreign Key - ANSWER-What a primary key from one table is called when it is referenced in another table. Important when starting to build relationships between tables. Refers to a primary key. One-to-Many - ANSWER-This is the most common relationship. Associates ONE record in ONE table with MULTIPLE records in another table. One-to-One - ANSWER-Associates only ONE record on one table with ONE record on another table. Data Manipulation Language (DML) - ANSWER-What language am I? Allows users to access and modify the data to MAKE queries, and GENERATE reports. Interacting with the data. Data Definition Language (DDL) - ANSWER-What language am I? Allows a database administrator to DEFINE the database structure, schema, and subschema. Data Control Language (DCL) - ANSWER-What language am I? Commands that CONTROL a database. Includes administering privileges and committing data. MySQL Community/MySQL Server - ANSWER-Is a FREE EDITION. Includes a complete set of database services and tools, and is suitable for non-commercial applications such as education. MySQL Enterprise - ANSWER-PAID EDITION for managing commercial databases. Includes MySQL Server AND additional administrative applications. MySQL Command-Line Client - ANSWER-A text interface included in the MySQL Server download. Allows developers to connect to the database server, perform administrative functions, and execute SQL statements. MySQL Workbench - ANSWER-Installed with MySQL Server AND allows developers to EXECUTE SQL commands using an editor. Database Model - ANSWER-A conceptual framework for database software containing 3 parts: Data Structures Operations Rules Relational Model - ANSWER-A database model based on mathematical principles with three parts: Data Structures Operations Rules Set - ANSWER-A collection of values or elements with NO INHERENT order / unordered. Denoted with braces {}. Domain - ANSWER-A named set of possible database values, such as integers, dictionary words, or logical values (TRUE and FALSE). Tuple - ANSWER-A finite sequence of values, each drawn from a fixed domain. Ordered in parentheses. Relation - ANSWER-A NAMED set of tuples, all drawn from the same sequence of domains. Relational Rules/Integrity Rules - ANSWER-Logical constraints that ensure data is valid and conforms to business policy. Governs the data. Structural Rules - ANSWER-Relational rules that govern data in every relational database. Business Rules - ANSWER-Relational rules specific to a particular database AND application. Discovered during database design. Table - ANSWER-A collection of data organized as columns and rows. Has a name, a fixed sequence of columns, and a varying set of rows. Column - ANSWER-Has a name and a data type. Row - ANSWER-An unnamed sequence of values. Each value corresponds to a column and belongs to the column's data type. Cell - ANSWER-A single column of a single row. In relational databases, each contains exactly one value. Aggregate - ANSWER-Computes functions over multiple table rows, such as SUM and COUNT. Join - ANSWER-A SELECT statement that combines data from two tables (left and right), into a single result. The tables are combined by comparing columns from the left and right tables. Data Query Language (DQL) - ANSWER-What language am I? Retrieves data from the database. Data Transaction Language (DTL) - ANSWER-What language am I? Manages database transactions. Database System Instance - ANSWER-A single executing copy of a database system. Personal computers usually run just one.