How do you differentiate between the logical and physical structure of data?
In essence, the logical design is about what data the database will store and how it is related, while the physical design is about how this data will be stored and accessed in the actual computing environment..
How does logical mode differ from physical mode?
The logical model and the physical model are separate models.
The logical model enables you to represent business information and define business rules.
The physical model enables you to focus on the physical implementation of the model in a database..
What are the types of data models
Logical ERD models information gathered from business requirements.
Entities and relationships modeled in such ERD are defined around the business's need.
The need of satisfying the database design is not considered yet.
Physical ERD represents the actual design of database..
What are the types of data models
Physical data model describes how the model will be presented in the database.
A physical database model demonstrates all table structures, column names, data types, constraints, primary key, foreign key, and relationships between tables..
What is the difference between logical and physical data storage?
Physical (disk) storage contains all the files in the database.
Logical storage structures, such as tablespaces, segments, extents, and blocks, appear on the disk but are not part of the dataset..
What is the difference between logical and physical database?
In essence, the logical design is about what data the database will store and how it is related, while the physical design is about how this data will be stored and accessed in the actual computing environment..
What is the difference between logical design and physical design in data warehouse?
Logical design is a high-level design and doesn't provide any detail.
Physical design is more graphical than textual; however, it can comprise both.
Logical design can be textual, graphic, or both.
A physical design focuses on specific solutions explaining how they are assembled or configured..
What is the difference between logical ERD and physical ERD?
Logical ERD models information gathered from business requirements.
Entities and relationships modeled in such ERD are defined around the business's need.
The need of satisfying the database design is not considered yet.
Physical ERD represents the actual design of database..
What is the difference between physical and logical data structure?
For example, a database might use a logical data structure such as a relational model, where data is organised into tables with rows and columns.
However, the physical data structure used to store this data on disk might be a B-tree or a hash table, which are more efficient for data retrieval and storage..
- The logical data model is used as the blueprint of what data is involved while the physical data models detail how that data will be implemented.
Then database administrators and application developers will convert the logical data model into the tables, columns, keys, and other physical entities of a database.