De‐normalization is the process of attempting to optimize the performance of a database by ADDING redundant data. It is sometimes necessary because current DBMS's 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.

De‐normalization is the process of attempting to optimize the performance of a database by adding redundant data. It is sometimes necessary because current DBMS's 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.