Denormalize the data model to improve performance

You might need to denormalize the data model to reduce overhead and optimize performance.

The entity-relationship data model, which the IBM® Informix® Guide to SQL: Tutorial describes, produces tables that contain no redundant or derived data. According to the tenets of relational database theory, these tables are well structured.

Sometimes, to meet extraordinary demands for high performance, you might need to denormalize the data model by modifying it in ways that are undesirable from a theoretical standpoint. This section describes some modifications and their associated costs.

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