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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
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