What Is Difference Between Logical And Physical Data Model?

What is the difference between logical and physical schema?

A logical schema is a conceptual model of the data.

In relational databases, it’s often platform-agnostic – i.e.

the logical schema can, in principle, be implemented on any SQL database.

The physical schema converts the logical schema into an implementation that works on a particular database platform..

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 are the 3 types of schema?

Schema is of three types: Physical schema, logical schema and view schema.

What is physical and logical data independence?

Logical data independence: The ability to change the Conceptual (Logical) schema without changing the External schema (User View) is called logical data independence. … Physical data independence: The ability to change the physical schema without changing the logical schema is called physical data independence.

What is physical schema in database?

Physical schema is a term used in data management to describe how data is to be represented and stored (files, indices, et al.) in secondary storage using a particular database management system (DBMS) (e.g., Oracle RDBMS, Sybase SQL Server, etc.).

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 a logical connection?

A A logical connection consists of a pair of physical connections that are configured in a warm-standby environment. … The source of the replication data is the active database while the target of replication is the standby database.

What is logical network diagram?

A logical network diagram illustrates the flow of information through a network and shows how devices communicate with each other. It typically includes elements like subnets, network objects and devices, routing protocols and domains, voice gateways, traffic flow and network segments.

What is the difference between logical and physical?

The basic difference between Logical and physical address is that Logical address is generated by CPU in perspective of a program whereas the physical address is a location that exists in the memory unit.

Is IP address logical or physical?

IP Address works at the network layer of OSI model (actually the IP layer of TCP/IP model). This is a logical address (and not the embedded hardware address) which is assigned by the Network administrator or Internet service provider. Hence IP address may change each time you connect with the Internet.

What is logical and physical connections explain with example?

For example, in a shared Ethernet network that uses hubs rather than switches, the logical topology appears as if every node is connected to a common bus that runs from node to node. However, its physical topology is a star, in which every node on the network connects to a central hub.