3842681
Descripción
Mapa Mental por yuroshyini1719, actualizado hace más de 1 año
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Creado por yuroshyini1719
hace más de 8 años
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Database Enviroment
- ANSI-SPARC
- American National Standards
Institute, Standards Planning
And Requirements
Committee.
- standard for DBMS
- Levels
- External
- user view
- user view
- Conceptual
- community view
- community view
- Internal
- physical
representation
of DB
- physical
representation
of DB
- External
- American National Standards
Institute, Standards Planning
And Requirements
Committee.
- Advantages
- customized
user view
- hides physical
storage details
from users
- changes by DB admin
doesn't effect user view
- customized
user view
- Data Model
- documentation
for data org.
- Record- Based
- Network
- Hierarchial
- Relational
- Network
- Object- Based
- Entity-Relationship
- Functional
- Object-Oriented
- Entity-Relationship
- documentation
for data org.
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