Glossary
- access
the operation of seeking, reading, or writing data on a storage unit.
- access method
a technique used to transfer a physical record from or to a mass storage device.
- access pattern
the general sequence in which the data structure is accessed (for example, from tuple to tuple (row to row), from record to record, from segment to segment, and so forth).
- accuracy
a qualitative assessment of freedom from error or a quantitative measure of the magnitude of error, expressed as a function of relative error.
- ad hoc processing
one-time-only, casual access and manipulation of data on parameters never before used, usually done in a heuristic, iterative manner.
- after image
the snapshot of data placed on a log on the completion of a transaction.
- agent of change
a motivating force large enough not to be denied, usually aging of systems, changes in technology, radical changes in requirements, and so forth.
- algorithm
a set of statements organized to solve a problem in a finite number of steps.
- alternate storage
storage other than disk-based storage used to hold bulk amounts of relatively inactive storage.
- analytical processing
using the computer to produce an analysis for management decision, usually involving trend analysis, drill-down analysis, demographic analysis, profiling, and so forth.
- application
a group of algorithms and data interlinked to support an organizational requirement.
- application database
a collection of data organized to support a specific application.
- archival database
a collection of ...
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