Explain The Difference Between External Internal And Conceptual Schemas

Explain The Difference Between External Internal And Conceptual Schemas. PPT file14 Explain the difference between external internal and conceptual schemas External schemas Allow data access to be customized at the level of individual users or groups of users using different VIEWS of the same conceptual schema Views are not stored in DBMS but they generated ondemand Conceptual (logical) schemas.

The external view is computed when accessed It is not stored Different external schemas can be provided to different categories of users Translation from external level to conceptual level is done automatically by DBMS at run time The conceptual schema can be changed without changing application Mapping from external to conceptual must be changed.

Conceptual schema Wikipedia

External Level The external level or view is closest to the users in the data file It isLogical or Conceptual Level The middle level in the three level architecture are known asInternal or Physical Level The internal or physical level describes the physical storage.

8 Explain the differences between user views a conceptual

SummaryOverviewData structure diagramA conceptual schema is a highlevel description of informational needs underlying the design of a database It typically includes only the main concepts and the main relationships among them Typically this is a firstcut model with insufficient detail to build an actual database This level describes the structure of the whole database for a group of users The conceptual model is als Text under.

Explain The Deference Between External, Internal, And

External Schema represents data accessed by end users or application programs it provides customized information to the end users Internal Schema represents the physical storage of data on a disk or a physical storage device Conceptual schema maps internal schema data to the external schema.