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A thick-client configuration has three tiers:

Java Client Tier. Applications run in this tier and use the JRE (Java Runtime Environment), a browser, and the Presentation Beans.

Application Server Tier. The BI Beans and the client-side OLAP API run in this tier.

Data Server Tier. The Oracle RDBMS runs in this tier. It contains the server-side OLAP API, a metadata provider, the metadata, N-pass OLAP functions, and Oracle OLAP. Oracle OLAP contains a calculation engine and one or more analytic workspaces.