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Indexes

... be found in the primary keys of tables, which have inherent indexes, additional columns may be referenced enough to consider the creation of an index to enhance performance. ...
Data Modeling
Data Modeling

...  Identify data elements in each user view and put into a structure called a normal form  Normalize user views  Integrate set of entities from normalization into one description Normalization – process of creating simple data structures from more complex ones © 2005 Pearson Prentice-Hall ...
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Object-relational impedance mismatch

The object-relational impedance mismatch is a set of conceptual and technical difficulties that are often encountered when a relational database management system (RDBMS) is being used by a program written in an object-oriented programming language or style, particularly when objects or class definitions are mapped in a straightforward way to database tables or relational schemata.The term object-relational impedance mismatch is derived from the electrical engineering term impedance matching.
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