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

Clinic, Need a sample of a clinic database relationships

Need a sample of a clinic database relationships

What are the aggregate objects in the data dictionary, What are the aggrega...

What are the aggregate objects in the data dictionary? Views Match codes Lock objects.

Discuss how the bi-directional implementations are made, Discuss how the bi...

Discuss how the bi-directional Implementations are made. In bi-directional implementation of the association, a pair of references must implement every link. The declarations a

Determine the method of choosing algorithms, Determine the method of Choosi...

Determine the method of Choosing Algorithms In general, most of operations are easy and have a satisfactory algorithm since description of what is to be done also shows how i

Explain dbms- ddl-domain-alias, Briefly explain each of the following datab...

Briefly explain each of the following database terms. Use no more than 2-3 lines for each term. 1. DBMS 2. Update Anomaly 3. Alias (referring to tables in SQL queries)

Evaluate the null hypothesis, 1.Suppose you are given a dataset that consis...

1.Suppose you are given a dataset that consists of a random sample of tasters, on which the following variables were obtained: (y) Zpref = taste preference for green beans store

Write short notes on transaction state, Write short notes on transaction st...

Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o

#title., losers with new information systems

losers with new information systems

Differentiate between pl/sql functions and procedures, Oracle & Distributed...

Oracle & Distributed Databases 1. Differentiate between PL/SQL functions and procedures. 2. Draw the diagram of logical structure of oracle database and explain it in brief.

Determine advantages of merging an association into a class, What are the a...

What are the advantages and disadvantages of merging an association into a class?  Advantages: i)  Less number of tables ii) Faster performance due to the fewer tables

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