The difference between ClearCase and ClearCase LT

The difference between ClearCase and ClearCase LT

1. Dynamic views

Rational ClearCase and Rational ClearCase LT offer snapshot views. Snapshot views work by copying versions of elements from VOBs to your computer. Your snapshot view will need to be updated periodically to see the latest versions of elements. An update operation copies the latest versions of elements from the VOB to your view. Rational ClearCase also offers dynamic views. A dynamic view uses the Multiversion File System (MVFS) to provide immediate, transparent access to data stored in VOBs. When you work in a dynamic view, you do not need to copy data from VOBs to your view; you see the latest versions of elements in real time.

2.      Multiple servers
Rational ClearCase and Rational ClearCase LT use a client-server architecture. A Rational ClearCase client process issues a request for a Rational ClearCase operation, such as checkout or checkin. Server processes that run on the host where the VOB resides handle the request. Rational ClearCase supports a multiple server configuration, so VOBs can be located on multiple, distributed hosts. Rational ClearCase LT supports a single server configuration, so VOBs can be located on only one server host.

3.      Advanced build tool
You can use the Rational ClearCase commands clearmake, omake, and clearaudit to perform makefile based builds of software systems. These commands provide the following powerful features: v Build auditing, with automatic detection of source dependencies, including header file dependencies v Automatic creation of permanent bill-of-materials documentation of the build process and its results v Sophisticated build-avoidance algorithms to guarantee correct results when building in a parallel development environment v Sharing of binaries among views, saving both time and disk storage v Parallel building, which applies the resources of multiple processors and multiple hosts to builds of large software systemsThese features are available only if you use dynamic views; therefore, they are available in Rational ClearCase but not in Rational ClearCase LT.

4.      Rational ClearCase MultiSite
Rational ClearCase MultiSite is an optional add-on to Rational ClearCase. Rational ClearCase MultiSite can be used for parallel software development and software reuse across geographically distributed project teams. Rational ClearCase MultiSite is not supported with Rational ClearCase LT.