IBM DevOps Code ClearCase: Difference between revisions

Revision as of 01:45, 18 October 2003

Revision as of 10:56, 10 January 2004

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'''Rational ClearCase''' is a [[software]] tool for [[revision control]] ([[configuration management]], [[SCM]] etc) of [[source code]] and other software development assets. It originally derived from a product of Apollo: DSEE, which was originallyported to Unix and further developed by Atria Software, whichafter HP bought Apollo. Atria later merged with Pure Software to form PureAtria. That firm merged with [[Rational Software]], who was purchased by [[IBM]]. IBM continues to develop and market ClearCase.

ClearCase novelty was in its versioned file system, which can be mounted as a virtual file system through a ''view'', selecting a consistent set of versions and allowing for the production of [[Derived Object|derived objects]]. The view allows thus to map to a [[Software Configuration]]. This was a departure from the ''repository''/''sandbox'' model, allowing for the early management of artifacts (before they are being checked in, and not limited to these first order configuration items).

An other originality of ClearCase is its MultiSite extension. In this model, there is no real master database, but instead peer ''replicas'', kept in-step in an asynchronous way (with close to no penalty to end-users).

In the recent years, a [[UCM]] extension has been developed, supporting a more traditional model.

==External Link==

* [http://www-3.ibm.com/software/awdtools/clearcase/ IBM's ClearCase site]

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