WGU - D426: Objective Assessment| 150 Questions and Answers!

WGU - D426: Objective Assessment| 150 Questions and Answers! Database Application - ANSWER Software that helps business users interact with database systems. Database Administrator - ANSWER Responsible for securing the database system against unauthorized users. A database administrator enforces procedures for user access and database system availability. Authorization - ANSWER 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. Rules - ANSWER Database systems ensure data is consistent with structural and business rules. Query Processor - ANSWER 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 efficient instructions are executed on the data. Storage Manager - ANSWER 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 uses indexes to quickly locate data. Transaction Manager - ANSWER 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. Metadata - ANSWER Data about the database, such as column names and the number of rows in each table. Relational Database - ANSWER Stores data in tables, columns, and rows, similar to a spreadsheet. Relational Database - ANSWER All _________ ________ systems support the SQL query language. Relational Database - ANSWER Relational systems are ideal for databases that require an accurate record of every transaction, such as banking, airline reservation systems, and student records. MongoDB (NoSQL) - ANSWER The newer non-relational systems are called NoSQL, for 'not only SQL', and are optimized for big data. SQL Statements - ANSWER INSERT inserts rows into a table. SELECT retrieves data from a table. UPDATE modifies data in a table. DELETE deletes rows from a table. CREATE TABLE (Statement) - ANSWER 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. Data Type - ANSWER INT stores integer values. DECIMAL stores fractional numeric values. VARCHAR stores textual values. DATE stores year, month, and day. Database Design - ANSWER Analysis Logical design Physical design