What are the three levels of database architecture?

 Architecture Levels of Data base System 

Data Base Task Group (DBTG) developed and published a proposal for a typical vocabulary and architecture for database systems in 1971. it had been appointed by Conference on information system and Language (CODASYL)

External Level/View: The external level view of various external of a database.  Each external view is the view of a particular user about the system.

Logical or Conceptual View: This is middle level view in three-level architecture. The logical or Conceptual level describe that data store in database. It contains the definition of the data to be store in the database. 

Internal or Physical Level: Internal level is responsible to store data media. It describes the physical representation of database on internal view.

 

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