all that is needed is there, and all that is there is needed.
Using this rule ensures that the database will endure
There are three levels of data modeling. They are conceptual, logical, and physical."Conceptual" means a definition of the problem, "logical" means a design of a solution to the problem, and "physical" means the solution of the problem.
1. Requirement Analysis 2. Conceptual Data Base Design 3. Logical Data Base Design 4. Schema Refinement 5. Physical Data Base Design 6. Security Design
What are the six phases of database design? Discuss each phase.Database design phases are:1. Requirements collection and analysis.2. Conceptual design.3. Logical design (data model mapping).4. Physical design.
Conceptual Design• written in customer's language• explaining the observable external characteristics ofthe system• contains no technical jargon (If it does, define it.)• describes the functions of the system• is independent of implementation• is linked to the requirements documentsTechnical design• describes of major hardware components and theirfunctions• shows hierarchy (organization) and functions of thesoftware components• shows data structures and data flow• shows interfaces
Conceptual database design is the process of constructing a model based on the enterprise. Logical database design is the process of constructing a specific data model. Physical database design is the process of producing of the database on the secondary storage.
The Conceptual Data Model
A high level data model serves the database designer by providing a conceptual framework in which to specify, in a systematic fashion, what the data requirements of the database users are, and how the database will be structured to fulfill these requirements.
The enterprise view of the data is described by the global conceptual schema (GCS), which is global because it describes the logical structure of the data at all the sites.
logical data : refer to the immunity of the external scheme towards changes in the conceptual scheme.physical data: refer to the immunity of the conceptual scheme towards changes in the internal scheme.
the overall logical data base description is referred to as a schema. it is sometimes also referred to as an overall modal of the data, a conceptual modal of the data, a conceptual schema
1. Requirement Analysis2. Conceptual List_six_major_steps_that_you_would_take_in_setting_up_a_database_for_a_particularBase Design3. Logical Data Base Design4. Schema Refinement5. Physical Data Base Design6. Security Design
data design in software engineering