WGU D115 OBJECTIVE ASSESSMENT LATEST VERS IONS 2024 ACTUAL EXAM COMPLETE 15 0 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ Software that helps business users interact with database systems. - ANSWERDatabase Application Responsible for securing the database system against unauthorized users. A database administrator enforces procedures for user access and database sy stem availability. - ANSWERDatabase Administrator Many database users should have limited access to specific tables, columns, or rows of a database. Database systems authorize individual users to access specific data. - ANSWERAuthorization Database syste ms ensure data is consistent with structural and business rules. - ANSWERRules Interprets queries, creates a plan to modify the database or retrieve data, and returns query results to the application. Performs query optimization to ensure the most efficie nt instructions are executed on the data. - ANSWERQuery Processor Translates the query processor instructions into low -level file -system commands that modify or retrieve data. Database sizes range from megabytes to many terabytes, so the storage manager u ses indexes to quickly locate data. - ANSWERStorage Manager Ensures transactions are properly executed. The transaction manager prevents conflicts between concurrent transactions. The transaction manager also restores the database to a consistent state in the event of a transaction or system failure. - ANSWERTransaction Manager Data about the database, such as column names and the number of rows in each table. - ANSWERMetadata Stores data in tables, columns, and rows, similar to a spreadsheet. - ANSWERRe lational Database All _________ ________ systems support the SQL query language. - ANSWERRelational Database Relational systems are ideal for databases that require an accurate record of every transaction, such as banking, airline reservation systems, and student records. - ANSWERRelational Database The newer non -relational systems are called NoSQL, for 'not onl y SQL', and are optimized for big data. - ANSWERMongoDB (NoSQL) INSERT inserts rows into a table. SELECT retrieves data from a table. UPDATE modifies data in a table. DELETE deletes rows from a table. - ANSWERSQL Statements A statement that creates a new table by specifying the table and column names. Each column is assigned a data type that indicates the format of column values. Data types can be numeric, textual, or complex. - ANSWERCREATE TABLE (Statement) INT stores integer values. DECIMAL stores fra ctional numeric values. VARCHAR stores textual values. DATE stores year, month, and day. - ANSWERData Type Analysis Logical design Physical design - ANSWERDatabase Design This phase specifies database requirements without regard to a specific database system. Requirements are represented as entities, relationships, and attributes. An entity is a person, place, activity, or thing. A relationship is a link between entities, and an attribute is a descriptive property of an entity. - ANSWERAnalysis Phase, Conceptual Design, Entity -Relationship Modeling (Database Design) This phase implements database requirements in a specific database system. For relational database systems, _________ design converts entities, relationships, and attributes into tables, keys, and columns. - ANSWERLogical Design (Database Design) Specifies indexes, table structures, and partitions. This phase adds indexes and specifies how tables are organized on storage media. Affects query processing speed but never affects the query result. - ANSWERPhysical Design Allows database designers to tune query performance without changes to application programs. - ANSWERData Independence To simplify the use of SQL with a general -purpose language, database programs typically use an ____________ _____________ _______________. - ANSWERApplication Programming Interface (API)
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