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Physical Data Models in Computers

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Conceptual data model

Instances of a class or object

They describe the properties of entities

Physical data model Signup and view all the answers

Conceptual Data Model is higher-level and closer to the way users perceive data Signup and view all the answers

To expand the database by adding a record type or data item Signup and view all the answers

It allows for changing hardware components without altering data or tables Signup and view all the answers

Alterations can be made to the conceptual schema without affecting the physical schema Signup and view all the answers

Centrally located in one main server Signup and view all the answers

To ensure high availability and fault tolerance Signup and view all the answers

Physical (low-level, internal) data models describe how data is stored in the computer.
Implementation data models bridge the gap between physical and conceptual data models, commonly used in commercial database management systems like relational data models.
Implementation data models are user-friendly but still closely reflect how data is organized in computer storage.
Activities related to database file structure reorganization include performance monitoring utilities, report generation utilities, and data conversion tools.
Other tasks involve backing up the database periodically on tape and modifying the conceptual schema to expand or reduce the database, change constraints, or add/remove record types or data items.
Physical Data Independence allows changing the internal schema without affecting the conceptual schema, enabling alterations in storage location without impacting data or tables.