Differentiate between logical database design and physical, Database Management System

Assignment Help:

Differentiate between logical database design and physical database design. Show how this separation leads to data independence?

Basis

Logical Database Design

Physical Database Design

 

Task

Maps  or  transforms  the  conceptual schema (or an ER schema) from the high-stages data model into a relational database schema.

The specifications for the stored database within terms of physical storage structures, record placement, and indexes are designed.

 

Choice of criteria

The mapping can proceed in two levels:

1. System independent mapping but data model-depending.

2. tailoring the schemas to a specific DBMS.

 

The following criteria are frequent used to guide the choice of physical database design option:

1. Response Time option

2. Space Utilization

3.Transaction throughout

 

Result

DDL statements within the language of the chosen DBMS that specify the conceptual and external stages schemas of the database system. But if the DDL statements involve a few physical design parameters, a completed DDL specification must wait until after the physical database.

An initial determination of storage structures and  the access  paths  for the database files. This corresponds to defining the internal schema in terms of Data Storage Definition Language.

 

The database design is separated into various phases. The logical database design and physical database design are two of them. This separation is commonly based on the concept of three-level architecture of DBMS that gives the data independence. Therefore, we can say in which this separation leads to data independence since the output of the logical database design is the conceptual and external level schemas of the database system that is independent from the output of the physical database design which is internal schema.


Related Discussions:- Differentiate between logical database design and physical

In the architecture of a database system which external leve, In the archit...

In the architecture of a database system which external level used? In the architecture of a database system view external level used.

Horizontal Fragmentation, I want to fragment existing table using java code...

I want to fragment existing table using java code... help me..!!

What is a super key, What is a super key? A super key is a set of one o...

What is a super key? A super key is a set of one or more attributes that collectively permits us to recognize uniquely an entity in the entity set.

What is conceptual schema, What is Conceptual Schema? Conceptual Schema...

What is Conceptual Schema? Conceptual Schema - Conceptual schema elaborates the structure of the overall database for a community of users. It hides the details of physical sto

Assignment SQL Management Server 2012, Have database built but having probl...

Have database built but having problems with some questions that go with the database

Explain the form of the create view command, We define a view in SQL throug...

We define a view in SQL through using the create view command. To describe a view, we must provide the view a name and must state the query in which computers the view. The form of

Define the terms- ddl and dml, Define the terms   i) DDL   ...

Define the terms   i) DDL   ii) DML   DDL: Data base schema is specified by a set of definitions expressed by a special   language known as a data def

Data control, Identify the need and use of data control through problem sol...

Identify the need and use of data control through problem solving, illustration

Relational model, A model in database system mostly defines the organisatio...

A model in database system mostly defines the organisation of data or structure and a set of operations on that data. Relational model is a easy model in which database is represen

Define entity integrity and referential integrity, Define entity integrity ...

Define entity integrity and referential integrity.  How does SQL allow specification of  these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd