Database Administrator - Responsible for securing the database system against unauthorized users. A database administrator enforces procedures for user access and database system availability.
Authorization - Many database users should have limited access to specific tables, columns, or rows o...
WGU - D426: Objective Assessment Test Questions and Answers Graded A 2024 Database Application - Software that helps business users interact with database systems. Database Administrator - Responsible for securing the database system against unauthorized users. A database administrator enforces procedures for user access and database system availability. Authorization - 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 - Database systems ensure data is consistent with structural and business rules. Query Processor - 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 - 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 - 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 - Data about the database, such as column names and the number of rows in each table. Relational Database - Stores data in tables, columns, and rows, similar to a spreadsheet. Relational Database - All systems support the SQL query language. Relational Database - 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) - The newer non-relational systems are called NoSQL, for 'not only SQL', and are optimized for big data. SQL Statements - INSERT inserts rows into a table. SELECT retrieves data from a table. U
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