Data logging

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Data logging is the practice of recording sequential data, often chronologically.

1 Etymology
2 Computer data logging
3 Automotive data logging
4 See also
5 References
6 Sources
7 External links

Etymology

To log is a verb derivative of the noun logbook; the verb form means to record in a logbook, and may have been coined in the 1820s. The term logbook itself stems from the practice of floating a stationary "log" (actually a wooden block attached to a reel via rope) to provide a fixed point of reference for the purpose of measuring a ship's speed (see Knot (speed)). Computer scientists adopted the verb to log circa 1963 to describe the systematic recording of specific types of data processing events.

Computer data logging

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Please improve this article if you can (February 2007).

Main article: Computer data logging

In computerized data logging, a computer program may automatically record events in a certain scope in order to provide an audit trail that can be used to diagnose problems.

Examples of physical systems which have logging subsystems include process control systems, and the black box recorders installed in aircraft.

Many operating systems and multitudinous computer programs include some form of logging subsystem. Some operating systems provide a syslog service (described in RFC 3164), which allows the filtering and recording of log messages to be performed by a separate dedicated subsystem, rather than placing the onus on each application to provide its own ad hoc logging system.

In many cases, the logs are not esoteric and hard to understand; they need to be subjected to log analysis in order to make sense of them.

It can be useful to combine log file entries from multiple sources. This approach, in combination with statistical analysis, may yield correlations between seemingly-unrelated events on different servers. Other solutions employ network-wide querying and reporting.

Automotive data logging

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Please improve this article if you can (February 2007).

In automotive all DTC(Diagnostic Trouble Codes) are logged in ECUs(Electronic Control Units) so that at the time of service of vehicle, service engineer will read all the DTCs by Tech-II or similar tools and will come to know problems occurred in Vehicle.