The process of duplicating a portion of a database from one environment to another and keeping the data in other…
A request for information from a database. There are three general methods for posing queries: (1) Choosing parameters from a…
Defines a data object as containing code (sequences of computer instructions) and data (information that the instructions operate on). Traditionally,…
Data items organized as a set of formally described tables from which data can be accessed or reassembled in many…
A special case of the hierarchical data model in which each record type can have multiple owners (e.g., purchase orders…
A data model that links records together like a family tree, but each record type has only one owner (e.g.,…
A file structure involving data records that have no structured interrelationship. A flat file takes up less computer space than…
The structure or format of a database, described in a formal language supported by the database management system. Schemas are…
A collection of programs that enables information to be stored in, modified, and extracted from a database. There are many…
A file that defines the basic organization of a database. A database dictionary contains a list of all files in…