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Conceptos clave de diseño de DB

Created by

ahima :3
ahima :3
Bolivia

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Conceptos clave de diseño de DB

by ahima :3
1

En diseño de base de datos se identifican entidades y relaciones mediante un diagrama ER.

2

El diseño físico es idéntico al diseño lógico.

3

Una clave primaria debe ser única y no puede contener valores nulos.

4

La clave primaria puede contener valores duplicados si la fila es temporal.

5

Las claves foráneas mantienen la integridad referencial entre tablas.

6

La denormalización nunca se utiliza en entornos de producción.

7

La normalización busca reducir la redundancia de datos mediante formas normales.

8

El diseño lógico describe entidades, atributos y relaciones sin preocuparse del motor de implementación.

9

El índice siempre debe crearse en todas las columnas de una tabla para mejorar el rendimiento.

10

Una base de datos bien normalizada evita por completo cualquier duplicidad de datos en todas las columnas.

 
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