Logical Data Dictionary focuses on key data elements (entities and fields) while Physical Data Dictionary describes
all tables
and columns.
What is physical and logical database?
A
logical database must be able to access and identify all files within the storage system to operate correctly
, whereas a physical database manages a much smaller field of information. Sometimes, a physical database stores only a single file with one value or word in it.
What is the difference between logical and physical model?
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 is the difference between logical and physical views of a database?
The viewing of database can be categorized into two categories: physical view and logical view. … Physical view refers to the way data are physically stored and processed in a database. On the other side, logical view is designed to suit the need of
different users
by representing data in a meaningful format.
What is physical data example?
A physical data model is a database-specific model that
represents relational data objects
(for example, tables, columns, primary and foreign keys) and their relationships. A physical data model can be used to generate DDL statements which can then be deployed to a database server.
What are examples of physical models?
- Model airplane.
- Model car.
- Model railway.
- Model rocket.
- Model house.
What is a logical data model used for?
A logical data model
establishes the structure of data elements and the relationships among them
. It is independent of the physical database that details how the data will be implemented. The logical data model serves as a blueprint for used data.
What are the components of physical and logical database?
– Schema objects consist of
database triggers, operators, sequences, indexes, and stored procedures etc
. that together comprise a schema. – A schema is a logical structure of data and such schema objects. – Schema objects are stored logically in a tablespace of the database.
What is logical data model with example?
For example, a simple logical data model for
a retail company can organize all necessary facts by store, product, and time
, which are three common business perspectives typically associated with a retail business. Logical data models are independent of a physical data storage device.
What is the logical structure of a database?
A Logical database uses only a hierarchical structure of tables i.e.
Data is organized in a Tree-like Structure
and the data is stored as records that are connected to each other through edges (Links). Logical Database contains Open SQL statements which are used to read data from the database.
What is the physical view?
Physical view refers
to the way data are physically stored and processed in a database
. On the other side, logical view is designed to suit the need of different users by representing data in a meaningful format. Another word, the logical view tells the users, in their term, what is in the database.
What is logical view of database?
A logical view of data is
a data model in an enterprise
. … A logical data object model contains logical data objects. A logical data object is an object that describes a logical entity in an organization, such as a customer or an order. It has attributes and keys, and it describes relationships between attributes.
What are five components of a DBMS?
- Software. …
- Data. …
- Procedures. …
- Database languages. …
- Query processor. …
- Runtime database manager. …
- Database manager. …
- Database engine.
What is a data model example?
The term data model can refer to two distinct but closely related concepts. Sometimes it refers to an
abstract formalization of the objects and relationships found in a particular application domain
: for example the customers, products, and orders found in a manufacturing organization.
What is physical data type?
A physical data type is
automatically assigned to each column based on the data type assigned to the corresponding attribute
. Deriving a physical model from a physical model. The corresponding data type for the target database is automatically assigned.
What is physical data format?
Physical files
contain the actual data that is stored on the system, and a description of how data is to be presented to or received from a program
. They contain only one record format, and one or more members. … Logical files do not contain data. They contain a description of records found in one or more physical files.
