Ch. 11 Logical Data Flashcards
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1. Physical 2.Logical
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data views (Know 2 views - ways of viewing)
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Physical view
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A data perspective that focuses on the actual format and location of the data.
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Logical view
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A data perspective that focuses on the meaning and content of the data.
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field
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A group of related characters.
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record
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A collection of related fields.
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database
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An integrated collection of logically related records or objects.
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primary key / key field
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A database has at least one distinctive field that uniquely identifies the record.
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batch processing
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Data is collected over several periods, and then processed all at once.
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real-time processing / online processing
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Data is processed at the same time the transaction occurs
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data redundancy
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Records for the same data entity may appear in different files.
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Data integrity
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Database characteristics relating to the consistency and accuracy of data.
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data definition subsystem
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Defines the logical structure of the database.
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query-by-example
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A database tool that supports viewing all or selected parts of the data
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SQL
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A specialized database programming language.
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1.Hierachical 2.Network 3.Relational 4.Multidimensional 5.Object-oriented
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DBMS structures (Know 5 models)
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Hierarchical database
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Field or records are structured in nodes in a one-to-many relationship.
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Network database
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A database structure that uses a many-to-many relationship.
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Relational database
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A database structure where data elements are stored in different tables, each of which consists of rows and columns.
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Multidimensional databases
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A data model that include additional or multiple dimensions.
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Object-oriented database
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A database that can store data as well as instructions to manipulate the data, and is able to handle unstructured data.
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1.Individual 2.Company 3.Distributed 4.Commercial
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Types of databases (Know 4 types)
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Individual database
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A collection of integrated files primarily used by just one person (AKA a personal computer database).
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Company database
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Databases companies create for their own use.
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Distributed database
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A database that is located in a place or places other than where users are located.
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Commercial database
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An enormous database that an organization develops to cover particular subjects.
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CSI - example of commercial database
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Offers consumer and business service, including electronic mail.
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Dialog Information Services - example of commercial database
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Offers business information, as well as technical and scientific information.
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Dow Jones Interactive Publishing - example of commercial database
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Provides world news and information on business, investments, and stocks.
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LexisNexis - example of commercial database
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Offers news and information on legal, public records, and business issues.
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data warehouse
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Data collected from a variety of internal and external databases and stored in one location.
