Recovery The restoration of a system (usually an online system) to an earlier moment in
time
Redundancy Multiple occurrences of the same unit of data
Referential integrity The process of relating data together in a disciplined manner
Relational model A form of data where data are normalized
Repeating groups A collection of data that occurs multiple times within a given record
of data
Repetitive data Data whose units repeat in terms of structure and even content
Report decompilation The process of reading a report and reducing the report to a
normalized database. In general report, decompilation is a nonlinear process because of
the complexity of the format of the report
Reporting The process of collecting data from various sources and presenting it to
business people in an understandable way
Repository A place where important corporate metadata are stored
Requirements A statement of what is needed in the functionality of a system
Reservations systems A system where corporation makes general reservations for
services and products, such as an airline, hotel chain, or car rental organization
Response time The measurement of time from when a transaction is initiated until the
first of the transaction output is returned to the user
ROI Return on investment
Rolling summary data A technique of archiving data where the most recent data are the
most detailed stored and where over time the detailed data are rolled up into a summary-
level data
Roman census approach The method of moving processing to the data rather than
moving data to the processor
Glossary