Concurrent Copy is an IBM software product developed in 1992 to reduce backup window. International Business Machines Corporation (IBM, or colloquially, Big Blue) NYSE: IBM (incorporated June 15, 1911, in operation since 1888) is headquartered in Armonk, NY, USA. The company manufactures and sells computer hardware, software, and services. ... Backup in computer engineering refers to the copying of data for the purpose of having an additional copy of an original source. ...
See also: Hitachi NanoCopy, List of IBM products Hitachi Data Systems Corporation (HDS) is a subsidiary of Hitachi. ... The following is a list of products from the International Business Machines (IBM) office and data processing equipment company, spanning from early-to-mid-20th-century punched card machinery, time clocks, and typewriters, via mainframe computers and minicomputers, to microprocessors, PCs, laptop PCs, and more. ...
The Concurrent Versions System (CVS), also known as the Concurrent Versioning System, implements a version control system: it keeps track of all work and all changes in a set of files, typically the implementation of a software project, and allows several (potentially widely separated) developers to collaborate.
CVS utilizes a client-server architecture: a server stores the current version(s) of the project and its history, and clients connect to the server in order to check-out a complete copy of the project, work on this copy and then later check-in their changes.
CVS uses delta compression for efficient storage of different versions of the same file, in cases where the files are text.
In addition, even though copying and updating take place concurrently, the copy reflects the state of the database at the time that the backup recovery facility is started and it does not contain any of the updates that took place within the database while the copy was being made.
As should be readily apparent, with this concurrentcopy technique even if the data in the volumes is being modified as the copy is being made, the copy that is being generated reflects the state of the data in the database at the time that the backup recovery facility was invoked.
Since the concurrentcopy is a snapshot of the original database taken at time t.sub.0, the updating that takes place within the original database as the copy is being made will have no affect on the concurrentcopy and thus will have no affect on the DSS functions.
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