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AIS Romney Chapter 4
Chapter 4 definitions
20
Accounting
01/31/2010

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Term
database system
Definition
The combination of the database, the database system management system, and the application programs that access the database through the database system.
Term
data warehouse
Definition
Very large databases that contain both detailed and summarized data for a number of years and that are used for analysis rather than transaction processing.
Term
data mining
Definition
Accessing information stored in a data warehouse through statistical analysis intellingence techniques to "discover" unhypothesized relationships in the data.
Term
record layout
Definition
A document that illustrates the arrangement of items of data in input, output, and file records.
Term
logical review
Definition
The manner in which a user or programmer conceptually organizes, views, and understands the relationships among data items.
Term
schema
Definition
A description of the types of data elements that are in the database, the relationships among the data elements, and the structure or overall logical model used to organize and describe the data.
Term
conceptual-level schema
Definition
The organization-wide view of the entire database. It lists all data elements in the database and the realtionships between them. Contrast with external-level schema and internal-level schema.
Term
external-level schema
Definition
An individual user's or application program's view of a subset of the organization's database. Each of these views is also referred to as a subschema.
Term
subschema
Definition
(1)A subset of the schema that includes only those data items used in a particular application program or by a particular user. (2) The way the user defines the data and the data relationships.
Term
internal-level schema
Definition
A low-level view of the entire database describing how the data are actually stored and accessed. It includes information about record layouts, definitions, addresses, indexes and so forth.
Term
data-manipulation language(DML)
Definition
A database management system language used for data maintenance, which includes such operations as updating, inserting, add deleting portions of the database.
Term
data query language (DQL)
Definition
A high-level, English-like command language that is used to interrogate a database. The DQL retrieves, sorts orders and presents subsets of the database in response to user queries.
Term
report writer
Definition
A language that simplifies report creation. Typically, users need only specify which data elements they want printed and how the report should be formatted.
Term
data model
Definition
An abstract representation of the contents of a database.
Term
relational data model
Definition
A database model in which all data elements are logically viewed as being stored in the form of two-dimensional tables called "relations". In these tables each row represents a unique entity or record.
Term
primary key
Definition
The attribute, or combination of attributes, that uniquely identifies a specific row in a database table. The primary key is used to distinguish, order and reference records in a database.
Term
foreign key
Definition
An attribute appearing in one table that is itself the primary key of the table. Foreign keys are used to link tables.
Term
relational database
Definition
A database management system that uses the relational data model.
Term
normalization
Definition
The process of following the guidelines for properly designing a relational database that is free from delete,insert,and update anomalies.
Term
database management system (DBMS)
Definition
The specialized computer program that manages and controls the data and interfaces between the data and the application programs.