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Access speed
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is the time between when you ask for a file and the computer delivers it to you.
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Alphabetic validation
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makes sure only letters appear in a field.
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Archive
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is a copy of older data that becomes historical records.
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Attribute
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is a quality than an object possesses.
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Child
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is a sub-directory or sub-folder.
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Class
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is a collection of similar objects.
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Cluster
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is an organized collection of sectors.
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Compound primary key
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occurs when two or more fields identify a distinct record.
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Compressed file
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is a smaller file due to file compression.
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Compression ratio
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determines how small you want a compressed file to be.
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Compression software
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is utility software that allows you to compress a file or files.
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Data
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are distinct itmes that don't have much meaning to you in a given context.
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Database
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stores and organizes data.
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Database administrator (DBA)
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designs, implements, and maintains solutions to business challenges using databases.
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Database management system (DBMS)
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is application software that allows you to arrange, modify, and extract data from a database to create information.
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Data broker
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is a company that searches many databases and returns information to you.
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Data dictionary
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defines the basic organization of a database.
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Data file
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contains organized data destined for use in a database.
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Data integrity
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makes sure the right type of data is in each field.
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Data security
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restricts database access for viewing, organizing and updating data files.
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Data structure
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organizes data in a uniform manner.
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Decompress
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is "unshrinking" a compressed file back to its original size.
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Defragmentation program
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reallocates file clusters and decreases fragmentation.
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Disk compression utility
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operates between the compressed files and the operating system.
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Entity
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is a distinct item in a database.
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Field
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is the smallest piece of meaningful data.
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Field name
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describes what's in a field.
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File allocation table (FAT)
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is a file that stores information about the physical location of every file on the computer's hard disk.
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File backup system
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copies files and stores them in a safe place.
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File compression
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can shrink a file or files into a smaller file.
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File management system
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coordinates how the computer organizes and keeps track of files.
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Form
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is a graphical interface that makes it easy to add or delete data.
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Fragmentation
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occurs when your computer places parts of files over many hard disk areas.
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Hierarchical database
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uses an inverted directory tree structure to organize data under different directories.
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Hypertext database
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lists each Web address as an object linked to its respective Web page.
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Importing
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is bringing files into a database.
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Information
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is organized data that have meaning and are useful to you in a given context.
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Many-to-many relationship
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relates many records in a record type to many others in a different record type.
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Middleware
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is a software application that works between the database and the Web browser.
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Network database
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uses a tree structure similar to the hierarchical database, but its children can have more than one parent.
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Numeric validation
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makes sure only numbers appear in a field.
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Object-oriented database
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uses objects to represent entities rather than fields in tables.
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One-to-many relationship
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relates one record of a record type to many others of a different type.
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One-to-one marketing
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allows businesses to provide you with goods and services they tailor to your buying habits.
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One-to-one relationship
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means that one record of a related type can be related only to one other different record in a record type.
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Parent
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is a directory similar to a folder in file systems.
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Personal portal
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integrates all of your information in one Web site.
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Primary key
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is the field in a table that is specific to only one record in the table.
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Property
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is the type of data in a field (for example, numeric, date, and currency).
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Query
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is specialized language for extracting data from a database.
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Query-by-example (QBE)
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tells the database what kind of information you want.
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Query language
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is a specialized language that uses English statements to pull data from a database.
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Record
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is a complete data entry.
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Relational database
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stores data in tables that have rows and columns.
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Relationship
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is an assocation between database entries.
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Report
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is a graphical display of your data.
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Report generator
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creates a written or Web report of information you request.
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Sector
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is a single area that can hold a certain number of bytes of data.
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Structured query language (SQL)
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is the default query language for most databases.
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Table
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is an organized collection of records.
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Unzipping
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is another word for decompressing a file.
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Web catalog
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uses a database to provide images, information and pricing on available items.
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Web-enabled database access
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modifies and presents information through a Web browser.
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Zipping
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is another word for compressing a file.
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2002 McGraw-Hill Higher Education