What is the meaning of data independence Mcq

Explanation: The term “Data independence” refers that the program should not be dependent on either the logical attributes of data or physical attributes of data.

What is data independence in DBMS PPT?

Data Independence When a schema at a lower level is changed, only the mappings between this schema and higher-level schemas need to be changed in a DBMS that fully supports data independence. The higher-level schemas themselves are unchanged.

What is data independence differentiate between different types of data independence?

Physical Data IndependenceLogical Data IndependenceIt is easy to retrieve.It is difficult to retrieve because the data is mainly dependent on the logical structure of data.

What is data independence Tutorialspoint?

Data independence basically means that if data is changed at a level, it does not impact the data view at the higher levels. Hence, the data at the higher levels should be independent of the data modification in the lower levels.

Which of the following correctly refer to the term data independence?

Answer: d. Explanation: The term “Data Independence” refers that the programs are not dependent on the physical attributes of data and neither on the logical attributes of data.

Which one of the following refers to the data about data *?

Computer Science Class 9 Englis… Metadata represents Data about Data that means it describes information about another Data. 7. In the Database Management system, the lowest level of data abstraction is the physical level. It is used to store data and describes how the data is stored in databases.

What will be the Subschema expresses?

A sub-schema expresses The physical view. The external view.

How view is related to data independence?

Views provide data independence to an application as the application depends on a view but not on a real table. Therefore, any change in the table will not affect the application, and an application will always be independent of the table schema design.

What is data independence describe the three schema architecture?

Data Independence. The three-schema architecture can be used to further explain the concept of data independence, which can be defined as the capacity to change the schema at one level of a database system without having to change the schema at the next higher level.

What is meant by data redundancy and data security?

Data redundancy is a condition created within a database or data storage technology in which the same piece of data is held in two separate places. This can mean two different fields within a single database, or two different spots in multiple software environments or platforms.

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What is data independence explain logical data independence and physical data independence with respect to three layer architecture of DBMS?

Data independence can be explained using the three-schema architecture. Data independence refers characteristic of being able to modify the schema at one level of the database system without altering the schema at the next higher level.

What is importance of logical data independence?

Logical data independence allows us to make changes like adding, modifying or deleting an attribute, entity, or even a relationship. Doing such modifications does not call for rewriting the application program, but to make corresponding alterations in the program.

What's the difference between logical data independence and physical data independence?

Physical Data Independence modifies the physical schema without causing the application program to be rewritten. Logical Data Independence modifies the logical schema without causing the application program to be rewritten.

Which of the following characteristics allows program data independence?

Data Abstraction: A data model is used to hide storage details and present the users with a conceptual view of the database. In other words, this allows the program data independence and program operation independence.

Which is the type of data independence Mcq?

Question 2 Explanation: Two Levels of data independence are – Physical and Logical data independence.

What is physical data independence in DBMS Mcq?

Physical Data Independence: The ability to change the internal schema without having to change the conceptual schema.

How does data redundancy occur?

Data redundancy occurs when the same piece of data is stored in two or more separate places. Suppose you create a database to store sales records, and in the records for each sale, you enter the customer address. Yet, you have multiple sales to the same customer so the same address is entered multiple times.

What do you understand by the term data?

In computing, data is information that has been translated into a form that is efficient for movement or processing. Relative to today’s computers and transmission media, data is information converted into binary digital form. … Raw data is a term used to describe data in its most basic digital format.

What is the full form of DDL?

In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices, and users. DDL statements are similar to a computer programming language for defining data structures, especially database schemas.

What does Subschema mean Mcq?

Que.A subschema expressesa.the logical viewb.the physical viewc.the external viewd.all of the above

How records are organized in hierarchical model?

A hierarchical database model is a data model in which the data are organized into a tree-like structure. The data are stored as records which are connected to one another through links. A record is a collection of fields, with each field containing only one value.

How many types of DBMS architecture are there?

Types of DBMS Architecture But logically, database architecture is of two types like: 2-tier architecture and 3-tier architecture.

Which of the following data independence is difficult to achieve?

Logical data independence is more difficult to achieve than physical data independence, since application programs are heavily dependent on the logical structure of the data that they access.

What does SQL stand for?

SQL (pronounced “ess-que-el”) stands for Structured Query Language. SQL is used to communicate with a database. According to ANSI (American National Standards Institute), it is the standard language for relational database management systems.

What does a database contain?

The information in many databases consists of natural-language texts of documents; number-oriented databases primarily contain information such as statistics, tables, financial data, and raw scientific and technical data. Small databases can be maintained on personal-computer systems and used by individuals at home.

What is data independence How can it be related to the three level architecture?

Data independence means a change of data at one level should not affect another level. Two types of data independence are present in this architecture: Physical Data Independence: Any change in the physical location of tables and indexes should not affect the conceptual level or external view of data.

What is logical data independence the capacity to change?

a) Logical data independence is the capacity to change the conceptual schema without having to change external schemas or application programs.

What are the 3 types of schema?

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

What is data dictionary explain its types?

A Data Dictionary Definition A Data Dictionary is a collection of names, definitions, and attributes about data elements that are being used or captured in a database, information system, or part of a research project.

What is data redundancy example?

Data redundancy is defined as the storing of the same data in multiple locations. An example of data redundancy is saving the same file five times to five different disks.