a2zinterviews

81.	What are calculation contexts?
	By default, BUSINESSOBJECTS determines the result of a measure based on the dimension or dimensions in the part of the report in which the measure is inserted. These sets of dimensions are called calculation contexts. Calculation contexts are dynamic in BUSINESSOBJECTS.
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82.	What is a repository?
	It is a relational data account created on a database like Oracle, MS–Access, Informix, DB2 etc when the BO is installed. It will have all the BO system tables, metadata about designer, Information about universes, the actual universes, user documents and most importantly security information.
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83.	What are loops?
	Loop is a situation that occurs when more than one path exists from one table to another. Loops result in ambiguity in the design of a universe.
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84.	What are the different types of Strategies?
	In Designer we can specify two types of strategies : Built–in strategies External strategies
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85.	What is the difference between Built–in and External strategies?
	Built–in Strategies: Designer provides a number of default strategies which we can use. These are strategies for extracting joins, detecting cardinalities, and creating default classes and objects. Options for indicating default strategies are located in the Database tab of the Options dialog box. External Strategies: We can also create our own strategies. Such strategies are referred to as external strategies. With an external strategy, we can specify the exact way that objects and joins are to be extracted from the database structure. The strategy we use, for example, can be a script generated from a CASE Access tool. An external strategy is specific to one RDBMS.
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