Understanding Tiers and Components Of IBM Infosphere Information Server 8.5 [ServiceTier and Metadata Tier] (Continued…)

Services tier

The services tier consists of the application server, common services for the suite, and product module-specific services and the computer where those components are installed.

Services for IBM InfoSphere Information Server
Some services are common to all product modules. Other services are specific to the product modules that you install. The services tier must have access to the metadata repository tier and the engine tier.

The common services include

Ø  Scheduling services

Ø  Logging services

Ø  Directory services

Ø  Security services

Ø  Reporting services

Ø  Core services

Ø  Metadata services

 

Metadata repository tier

The metadata repository tier consists of the metadata repository database and, if installed, the IBM® InfoSphere® Information Analyzer database and the computer where these components are installed.

The metadata repository tier includes the metadata repository database for IBM InfoSphere Information Server. The database is a shared component that stores design-time, runtime, glossary, and other metadata for product modules in the InfoSphere Information Server suite.

If InfoSphere Information Analyzer is installed, the metadata repository also includes one or more analysis databases. The analysis databases are used by InfoSphere Information Analyzer when it runs analysis jobs.

The services tier must have access to the metadata repository tier. When product modules store or retrieve metadata, services on the services tier connect to the metadata repository tier and manage the interaction between the databases and the product modules.

For InfoSphere Information Analyzer, the engine tier and the client tier must also have direct access to the analysis databases.

Tier relationships

 
The below diagram explains about the connection and relationship between the Various tiers. The tiers provide services like job execution, and metadata and other data storage for the product modules that you chosen to install.

Ø  Relationships differ depending on which product modules you install.

Ø  Client programs on the client tier communicate primarily with the services tier. However the IBM® InfoSphere® DataStage® and QualityStage™ clients will also communicate with the engine tier.

Ø  Various services within the services tier communicate with agents on the engine tier.

Ø  Metadata services on the services tier communicate with the metadata repository tier.

Ø  ODBC drivers on the engine tier communicate with external databases.

Ø  IBM InfoSphere Metabrokers and bridges on the client tier can import data from external sources.

       Some InfoSphere Metabrokers and bridges can export data. With the IBM InfoSphere Information Analyzer product module, the engine tier communicates directly with the analysis databases on the metadata repository tier. The InfoSphere Information Analyzer client also communicates directly with the analysis databases.