Dynamic Repository Variables:
You initialize dynamic repository variables in the same way as static variables, but the values are refreshed by data returned from queries. When defining a dynamic repository variable, you will create an initialization block or use a pre-existing one that contains a SQL query. You will alsoset up a schedule that the Oracle BI Server will follow to execute the query and periodically refresh the value of the variable.
Note: The value of a static repository value is initialized in the Variable dialog box. This value persists, and does not change until an Oracle BI Administrator decides to change it.

Explanation
NQSConfig.ini is the main configuration file of Bi Server and contains a lot of parameters.
The parameters in the Query Result Cache Section provide configuration information for Oracle BI Server caching. The query cache is enabled by default. After deciding on a strategy for flushing outdated entries, you should configure the cache storage parameters in Fusion Middleware Control and in the NQSConfig.INI file.

Explanation/Reference:
Horizonal Scaleout of System Components
* Used for adding additional managed servers (Java components) and
system components to an existing cluster
* Used for scalability and failover
* Set up via the Universal Installer > Scale Out BI System option

Explanation
Users in Oracle BI Answers can create queries that span multiple subject areas, as long as the subject areas correspond to the same business model.

Explanation/Reference:
Note:
At the highest level, an OBIEE Metadata Repository includes three layers of information:
1. First, a Physical layer is defined. The metadata layer identifies the source data.
2.Second, a Business Model and Mapping layer is defined. This metadata layer organizes the physical layer into logical categories and records the appropriate metadata for access to the source data.
3.Finally, the Presentation layer is defined. This metadata layer exposes the business model entities for end-user access.