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 DFD example?
A data flow diagram (DFD) is a graphical representation of the “flow” of data through an information system. • DFDs can also be used for the visualization of data processing (structured design). • It views a system as a function that transform the input into desired output .
What is a logical view?
Logical view: The logical view is concerned with the functionality that the system provides to end-users. It uses the UML Component diagram to describe system components. UML Diagrams used to represent the development view include the Package diagram.
What is logic diagram?
logic diagram (plural logic diagrams) A diagram in the field of logic. Any non-spatial, abstract diagram. Any schematic display of the logical relationships of project activities. A graphical representation of a program using formal logic.
What is the purpose of normalization?
The main purpose of normalization is to minimize the redundancy and remove Insert, Update and Delete Anomaly. It divides larger tables to smaller tables and links them using relationships. Data redundancy happens when the same piece of data is held in two separate place.
What is System flowchart?
System flowcharts are a way of displaying how data flows in a system and how decisions are made to control events. To illustrate this, symbols are used. Data flow charts do not include decisions, they just show the path that data takes, where it is held, processed, and then output .
What is physical design and logical design?
The logical design is more conceptual and abstract than the physical design. In the logical design, you look at the logical relationships among the objects. In the physical design, you look at the most effective way of storing and retrieving the objects. Your design should be oriented toward the needs of the end users.
What is a logical architecture diagram?
Logical architecture is a structural design that gives as much detail as possible without constraining the architecture to a particular technology or environment. For example, a diagram that illustrates the relationship between software components. For example, a specification of software services and components.
What is the relationship 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. System design is of two types: Logical and physical design. Logical design represents processes of the system without showing actual methods of implementation.
What are the five major components of a DBMS?
The database management system can be divided into five major components, they are:
- Database Access Language.
What are the types of DFD?
There are twelve main Flowchart types: Basic Flowchart, Business Process Modeling Diagram (BPMN), Cross Functional Flowchart, Data Flow Diagram (DFD), IDEF (Integrated DEFinition) Flowchart, Event-driven Process Chain (EPC) Diagram, Influence Diagram (ID), Swimlane Flowchart, Process Flow Diagram (PFD), Specification
Also to know is, what is the difference between physical and logical diagram?
Data flow diagrams are categorized as either logical or physical. A logical data flow diagram focuses on the business and how the business operates. Conversely, a physical data flow diagram shows how the system will be implemented, including the hardware, software, files, and people involved in the system.
What are logical and physical files in DBMS?
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.
What is a logical network design?
A logical network is one that appears to the user as a single, separate entity although it might in fact be either an entity created from mutliple networks or just a part of a larger network. “When designing a network, the “logical” part refers to the IP addressing scheme used within the network.
What is a physical diagram?
A physical data flow diagram shows how the system will be implemented, including the hardware, software, files, and people in the system. It is developed such that the processes described in the logical data flow diagrams are implemented correctly to achieve the goal of the business.
What is physical level?
It is also known as the internal level. The physical level describes how data is actually stored in the database. In the lowest level, this data is stored in the external hard drives in the form of bits and at a little high level, it can be said that the data is stored in files and folders.
Similarly, what is the difference between physical and logical standby database?
The main difference between physical and logical standby databases is the manner in which log apply services apply the archived redo data. For physical standby databases, Data Guard uses Redo Apply technology, which applies redo data on the standby database using standard recovery techniques of an Oracle database.
What is a logical database?
Logical databases are special ABAP programs that retrieve data and make it available to application programs. The most common use of logical databases is still to read data from database tables and associate them with executable ABAP programs while defining the program contents.
What is a standby database?
A standby database is a database replica created from a backup of a primary database. By applying archived redo logs from the primary database to the standby database, you can keep the two databases synchronized. A standby database has the following main purposes: Disaster protection. Protection against data corruption.
Moreover, what is physical and logical data?
Logical Data Dictionary focuses on key data elements (entities and fields) while Physical Data Dictionary describes all tables and columns.
What do you mean by normalization?
Normalization is a systematic approach of decomposing tables to eliminate data redundancy(repetition) and undesirable characteristics like Insertion, Update and Deletion Anomalies. It is a multi-step process that puts data into tabular form, removing duplicated data from the relation tables.