In software configuration management (SCM), a "delta" is a type of file in which the difference (or diff) between two successive versions, is recorded. This term suggests that differences should be small (2% different in average). So, using it can vastly reduce the amount of storage required. SCM is an acronym for Software Configuration Management, and relates to configuration management (CM). ... Difference in arithmetic: see Subtraction Difference in computing: see Delta encoding Difference on a coat of arms: see Heraldry Difference as a state of being unlike others: see The set theoretic difference or complement See Gilles Deleuze and other See also: Comparison, Similarity (mathematics), Similarity (psychology) This is a disambiguation... In computing, diff is a utility that outputs the difference between two text files. ...
A delta can be defined in 2 ways,symmetric delta and directed delta.
A symmetric delta can be expressed as , where v1 and v2 represent two successive versions.
A directed delta, also called a change, is a sequence of (elementary) change operations which, when applied to one version v1, yields another version v2 (note the correspondence to transaction logs in databases).
Delta encoding is a way of storing data in form of differences (deltas) between sequential data rather than data themselves.
A variation of delta encoding which encodes differences between the prefixes or suffixes of strings is called incremental encoding.
Delta encoding performs best when data has small or constant variation; for an unsorted data set, there may be little to no compression possible with this method.
Delta encoding is a way of storing or transmitting data in the form of differences between sequential data rather than complete files.
Delta encoding is sometimes called deltacompression, particularly where archival histories of changes are required (e.g., in software projects).
In delta encoded transmission over a network where only a single copy of the file is available at each end of the communication channel special error control codes are used to detect which parts of the file has changed since its previous version.
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