A Tier is a logical group of components within InfoSphere Information Server and the computers on which those components are installed.
The tiers provide services, job execution, and metadata and other data storage for your product modules.
Client: The
client programs and consoles that are used for development and administration and
the computers where they are installed.
Engine : The
logical group of components (the InfoSphere Information Server engine
components, service agents, and so on) and the computer where those components are
installed. The engine runs jobs and other tasks for product modules
Services: Application
server, common services, and product services for the suite and product modules
and the computer where those components are installed. The services tier
provides common services (such as metadata and logging) and services that are
specific to certain product modules
Metadata Repository: The metadata repository and, if installed,
the IBM InfoSphere Information Analyzer analysis database and the computer where
these components are installed. The metadata repository database contains the
shared metadata, data, and configuration information for InfoSphere
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