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By Barus C.

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5) between the base entities to establish the necessary foreign keys. Note that the junction table is called GRADE with the following contents: Ⅲ COURSE_ID — the primary key for the COURSE table Ⅲ STUDENT_ID — the primary key for the STUDENT table Ⅲ GRADE — a single, nonkey attribute for both foreign keys Next, consider the question: In what context does a grade have meaning? Stating that “the grade was A in CS- 101” is insufficient and stating, “Joe earned an A” makes no sense. Only when both the student number and the course number are associated does the grade column have meaning.

Level Fact Table STORE KEY PRODUCT KEY PERIOD KEY Dollars Units Price Product Dimension PRODUCT KEY Store Dimension PERIOD KEY Period Desc. Year Quarter Month Day Current Flag Resolution Sequence Product Desc. 10 A Sample Star Schema of normalized databases, which means prejoining tables to avoid the high performance costs of runtime SQL joins. In summary, the basic principle behind the star query schema is to introduce highly redundant data for performance reasons. OBJECT-ORIENTED DATABASE DESIGN Rather than rebuild the Oracle engine as an object-oriented architecture, Oracle decided to keep the base relational engine and add object-oriented functionality on top of the standard relational architecture.

Since the first publication of Dr. Edgar F. Codd’s 1993 research paper, “Providing OLAP (Online Analytical Processing) To User-Analysts: An IT Mandate,” database designers have attempted to find an optimum way of structuring tables for low data redundancy. Codd’s rules of normalization guide designers to create logically correct table structures with no redundancy, but performance rules often dictate the introduction of duplicated data to improve performance. This is especially true for distributed Oracle databases.

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