What is De-normalization?

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De-normalization is the process of attempting to optimize the performance of a database by
adding redundant data. It is sometimes necessary because current DBMSs implement the
relational model poorly. A true relational DBMS would allow for a fully normalized
database at the logical level, while providing physical storage of data that is tuned for high
performance. De-normalization is a technique to move from higher to lower normal forms
of database modeling in order to speed up database access.