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INFS247Chapter7

terms and whatnot

QuestionAnswer
1st Database Development Activity Project Planning and Initiation
2nd Development Activity Conceptual Design (Requirement Collection and ER Modeling)
3rd Development Activity Logical Design (Relational Modeling)
4th Development Activity Implementation (Via DBMS)
5th Development Activity Use (via DBMS or Indirect) and Maintenance
Entity Person, place, object, event, or concept
Attribute Property or characteristic of an entity
Key Attribute An attribute that uniquely identifies individual instances of an entity
Relationship An association among the instances of entity types
Cardinality Constraints The number of instances of one entity that can or must be associated with each instance of another entity. Consists of: - Minimum Cardinality (Participation) - optional - mandatory - Maximum Cardinality - One - Many
Primary Key - Uniquely identifies a row in a relational table - Equivalent to the Key attribute in the ER model
Foreign Key - Used to implement relationships (one-to-one, one-to-many, many-to-many) in relational model - Depicted by the Referential Integrity Constraint: a line with an arrow pointing from the foreign key to its source.
Components of a DBMS - Data definition - Data manipulation - Application generation - Data administration
Data definition component allows user to create tables and relationships
Data manipulation allows users to create, read, update, and delete information in a database.
Application generation Allows users to create various interfaces to databases. Users can define report and form formats.
Data administration Allows DBA (Data Base Administrator) to maintain technical aspects of database systems (such as performance, security, etc.)
Created by: simonaa29
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