Data Management Foundation C175 WGU

Associative Entity - answer-An associative entity is an element of the entity-relationship model. All relationships for the associative entity should be many. Attribute - answer-An attribute is a property or characteristic of an entity. Binary relationship - answer-A binary relationship is a relationship between two entity types. Candidate Key - answer-Is any column or a combination of columns that can qualify as unique key in database. Cardinality - answer-Cardinality represents the maximum number of entities that can be involved in a particular relationship. Cartesian product - answer-Usually the result of a missing join condition or a method of expanding the data of 1 table by the number of rows in the second table. Cascade Delete - answer-Will delete all records that reference the primary key column subquery - answer-Returns a single column of one or more values. data encryption - answer-When data is encrypted, it is changed, bit by bit or character by character, into a form that looks totally garbled. It can and must be reconverted, or decrypted, back to its original form to be of use. Data normalization - answer-Is a methodology for organizing attributes into tables so that redundancy among the non-key attributes is eliminated. Data volatility - answer-Describes how often stored data is updated. Data Volume Assessment - answer-Understanding of how much data will be in a database or a table within a database Database - answer-A database is a collection of information that is organized so that it can easily be accessed, managed, and updated. DCL - answer-Data control language is used to control access to data stored in a database. DDL - answer-Data definition language - involves instructing the DBMS software on what tables will be in the database, what attributes will be in the tables, which attributes will be indexed, and so forth. Definer - answer-Definer is a MySQL term where AuthID is the same for another DBMS Denormalization - answer-The act of duplicating data in a database for performance or the preservation of historical information disaster recovery - answer-Involves rebuilding an entire information system or significant parts of one after a catastrophic natural disaster such as a hurricane, tornado, earthquake, building collapse, or even a major fire. DML - answer-Data manipulation language refers to the four basic operations that can and must be performed on data stored in any DBMS: data retrieval, data update, insertion of new records, and deletion of existing records. E-R model - answer-An E-R model is a data model for describing a database in an abstract way. embedded mode - answer-The SELECT command is embedded within the lines of a higher-level language program and functions as an input or "read" statement for the program. Entity - answer-An entity is an object or event in our environment that we want to keep track of. Foreign Key - answer-Is a field (or collection of fields) in one table that uniquely identifies a row of another table. Index - answer-Used to help a DBMS find data quickly Inner Join - answer-Shows row that have matches in both tables Intersection Data - answer-Intersection Data associated with the concatenation of two segments. Join - answer-Joins 2 tables together logical view - answer-Is a mapping onto a physical table or tables that allows an end user to access only a specified portion of data. Modality - answer-Modality represents the minimum number of entity occurrences that can be involved in a relationship. outer join - answer-Shows rows in one table that have no match in the other table. Two kinds of outer joins are left and right joins. Primary Key - answer-Uniquely identifies each record in the table. query mode - answer-The command goes directly to the relational DBMS, which evaluates the query and processes it against the database. Referential Integrity - answer-Referential integrity is a database concept that ensures that relationships between tables remain consistent. referential integrity - answer-Enforces rules to guarantee that the foreign key relationship stays intact with no mismatches. Response time - answer-Is the delay from the time that the Enter Key is pressed to execute a query until the result appears on screen. Restrict Delete - answer-Will not allow deletes if the primary key is referenced row subquery - answer-Returns a single row of one or more values.