Quick Answer: What Is The Difference Between Logical And Physical?

What is a logical structure?

Definition.

Logical structure refers to the way information in a document is organized; it defines the hierarchy of information and the relation between different parts of the document.

Logical structure indicates how a document is built, as opposed to what a document contains..

Is a characteristic or quality that describes a database entity?

A database record is a grouping of characters into a word, a group of words, or a complete number. An attribute is a characteristic or quality used to describe a particular entity.

Which of the following is the most prominent data manipulation language today?

Chapter 6QuestionAnswerThe most prominent data manipulation language today is:SQLA _______ organizes data in two-dimensional tables.Relational DBMSIn a relational database, the three basic operations used to develop useful sets of data are:Select, project, and join75 more rows

What are the 4 types of models?

This can be simple like a diagram, physical model, or picture, or complex like a set of calculus equations, or computer program. The main types of scientific model are visual, mathematical, and computer models. Visual models are things like flowcharts, pictures, and diagrams that help us educate each other.

What is a logical data model used for?

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.

What is physical and logical network?

A physical network connects two or more physical network interfaces. A logical network is a portion of a physical network that connects two or more logical network interfaces or devices. … A logical network interface or device is the software entity that is known by an operating system.

What is the relationship between logical and physical models?

The main aim of conceptual model is to establish the entities, their attributes, and their relationships. Logical data model defines the structure of the data elements and set the relationships between them. A Physical Data Model describes the database specific implementation of the data model.

What is physical structure of database?

4.1 Database physical structure This is a type of file unique to HiRDB that is used to store table and index data. This is the smallest unit of table and index data storage. One segment stores data from only one table or one index. A segment is composed of multiple, consecutive pages.

What is the difference between logical and physical design?

Logical design is the abstract representation of data, whereas physical design represents the actual process and data in the system. … Logical design represents processes of the system without showing actual methods of implementation.

What is the difference between logical view and 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 a logical connection?

A physical network connects two or more physical network interfaces. A logical network is a portion of a physical network that connects two or more logical network interfaces or devices. … A logical network interface or device is the software entity that is known by an operating system.

What is difference between physical and logical standby database?

The logical standby database is a database that does not have the schema structure exactly similar to the source database. In contrast, a physical standby database is a database that replicates the exact contents of its primary database across the Oracle Net Network layer.

What is the logical view of information?

The logical view/user’s view, of a database program represents data in a format that is meaningful to a user and to the software programs that process those data. That is, the logical view tells the user, in user terms, what is in the database.

What is the purpose of a logical data model?

A logical data model represents the organization of a set of data by standardizing the people, places, things (entities) and the rules and relationships between them using a standard language and notation. It provides a conceptual abstract overview of the structure of the data.

What is logical and physical structure of database?

The logical units of database space allocation are data blocks, extents, segments, and tablespaces. At a physical level, the data is stored in data files on disk (see Chapter 11, “Physical Storage Structures”). The data in the data files is stored in operating system blocks.

What is the difference between a physical and logical network diagram?

Logical network diagrams focus in on how traffic flows across the network, IP addresses, admin domains, how domains are routed, control points, and so on. … A physical network diagram will, ideally, show the network topology exactly as it is: with all of the devices and the connections between them.

What is logical network diagram?

Logical network diagrams A logical network diagram describes the way information flows through a network. Therefore, logical network diagrams typically show subnets (including VLAN IDs, masks, and addresses), network devices like routers and firewalls, and routing protocols.