Modes of operation

IBM® Rational® Change supports two modes of operation: stand-alone and central.

Stand-alone mode

In stand-alone mode, change requests (CRs) are stored in development databases connected to the server. To access a CR, a user must log on to the database where the CR is stored. To establish a CR-task relationship, both items must be in the same database. The available databases are limited to databases available to a particular IBM Rational Synergy server on which IBM Rational Change depends.

Stand-alone mode was the only way it behaved with 4.7 and earlier releases.

This diagram shows the stand-alone Rational Change server setup.

Stand-alone Rational Change server setup

Central mode

In central mode, all CRs are stored in the central CR database, which is a repository exclusively for CRs. IBM Rational Change is always implicitly connected to the central CR database.

A user can log on to any database within the central server cluster and still have access to all CRs. CR-task relationships are not restricted by the location of either item.

In addition, the databases in the central server cluster can span the IBM Rational Synergy servers and can be in geographically disparate regions.

Attention: You cannot remove a central database once it has been assigned to a server. The only option is to uninstall the server.

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