What is structural independence and why is it important?

Structural independence exists when it is possible to make changes in the file structure without affecting the application programs ability to access the data. It is important because without it any changes such as adding a field would render applications which access the new file structure inoperable.

What is structural independence?

Structural independence exists when changes in the database structure do not affect DBMS ability to access data. Structural dependence exists when changes in the database structure do not affect DBMS ability to access data.

What is the role of a DBMS and what are its advantages What are its disadvantages?

Advantages: Improved data sharingImproved data securityBetter data integrationMinimized data inconsistency Improved data accessImproved decision makingIncreased end-user productivityc. Disadvantages:Increased costsManagement complexityMaintaining currencyVendor dependenceFrequent upgrade/replacement cycles 8.

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What are the 4 types of database?

  1. 1) Centralized Database.
  2. 2) Distributed Database.
  3. 3) Relational Database.
  4. 4) NoSQL Database.
  5. 5) Cloud Database.
  6. 6) Object-oriented Databases.
  7. 7) Hierarchical Databases.
  8. 8) Network Databases.

What is physical data independence?

Physical data independence is the ability to modify the physical schema without causing application programs to be rewritten. … It means we change the physical storage/level without affecting the conceptual or external view of the data. The new changes are absorbed by mapping techniques.

What are the advantages of a database?

  1. Reducing Data Redundancy. The file based data management systems contained multiple files that were stored in many different locations in a system or even across multiple systems.
  2. Sharing of Data.
  3. Data Integrity.
  4. Data Security.
  5. Privacy.
  6. Backup and Recovery.
  7. Data Consistency.

What is database and its benefits?

Reduced data redundancy. Reduced updating errors and increased consistency. Greater data integrity and independence from applications programs. Improved data access to users through use of host and query languages.

What are two advantages of DBMS?

DBMS makes it possible for end users to create, read, update and delete data in database. ꔷReduced data redundancy. ꔷReduced updating errors and increased consistency. ꔷGreater data integrity and independence from applications programs.

Are the building blocks of database?

Tables are the core primary building blocks of a database. A Table is very much like a data table or spreadsheet containing rows (records) arranged in different columns (fields). At the intersection of field and a row is the individual bit of data for a particular record, called a cell.

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What is data example?

Data is the name given to basic facts and entities such as names and numbers. The main examples of data are weights, prices, costs, numbers of items sold, employee names, product names, addresses, tax codes, registration marks etc. Images, sounds, multimedia and animated data as shown.

What databases do we use everyday?

Relational databases are the most common database systems. They include databases like SQL Server, Oracle Database, Sybase, Informix, and MySQL. The relational database management systems (RDMS) feature much better performance for managing data over desktop database programs.

What is data independence and why is it important?

Data Independence is defined as a property of DBMS that helps you to change the Database schema at one level of a database system without requiring to change the schema at the next higher level. Data independence helps you to keep data separated from all programs that make use of it.

What is the difference between data dependence and data independence?

With data dependence, data descriptions are included with the application programs that use the data, while with data independence the data descriptions are separated from the application programs.

What is the main purpose of a database?

The purpose of a database is to help your business stay organized and keep information easily accessible, so that you can use it.

What are the key features of database?

  1. stores data in one central location.
  2. allows data to be shared by many users.
  3. provides user interfaces to work with the data.
  4. creates backups.
  5. controls who can access and edit the data.
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What are the advantages of database security?

  1. Deployment failure.
  2. Excessive privileges.
  3. Privilege abuse.
  4. Platform vulnerabilities.
  5. Unmanaged sensitive data.
  6. Backup data exposure.
  7. Weak authentication.
  8. Database injection attacks.

What is database advantage and disadvantage?

Minimized Data inconsistency If DBMS has reduced the data redundancy then the database system leads the better data consistency. Our data items appear only once (no redundancy) so the updated values are immediately available to all users.

How do you describe a database?

A database is a collection of information that is organized so that it can be easily accessed, managed and updated. Computer databases typically contain aggregations of data records or files, containing information about sales transactions or interactions with specific customers.

What are the applications of DBMS?

  1. Railway Reservation System –
  2. Library Management System –
  3. Banking –
  4. Education Sector –
  5. Credit card exchanges –
  6. Social Media Sites –
  7. Broadcast communications –
  8. Account –

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