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Redundancy is the state where duplicate rows of the same data is available in a database.
Lets say we have an employee database which contains 2 rows of the following data
Emp num Emp Name Age
12345 John 25
12345 John 25
This is data redundancy.
Data redundancy can be avoided by the use of keys in tables. If in the employee table we had defined a primary key condition for employee number, then the system would not allow us to enter 2 rows of the same data.
What else can I help you with?
What is the difference between controlled redundancy and uncontrolled redundancy?
Controlled redundancy refers to intentionally duplicating certain components in a system to ensure reliability and fault tolerance, whereas uncontrolled redundancy occurs unintentionally due to inefficient processes or lack of coordination. Controlled redundancy is planned and managed to enhance system performance, while uncontrolled redundancy can lead to inefficiencies and waste of resources.
What is data redundancy?
Storing the information several time leads to waste of storage space is called data redundacy. Data redundancy is a term used about databases and means simply that some data fields appear more than once in the database. Data redundancy is wasteful and inefficient for several reasons and database designers attempt to eliminate it as far as possible by using a technique called data normalization. Data redundancy occurs in database systems which have a field that is repeated in two or more tables. For instance, in case when customer data is duplicated and attached with each product bought then redundancy of data is a known source of inconsistency.
What is data redundancy and which characteristics of the file system can lead to it?
Data redundancy refers to repetitive data in the database. In a system with redundant data it is difficult to manage the relationships. Data redundancy is the result of poorly designed database. By implying proper constraints on the data it can be prevented.
What are the types of redundancy?
Redundancy means the repetation of data. There are 2 types of redundancy in image processing: 1. Global Its caused by similar patterns being repeated over the image. 2. Local If the neighboring pixels do not change abruptly, but change gradually in their values. ANSWER : it does not pertain to data but circuits and whole systems if one fail a redundant system will continue to work. see reliability.
What is the difference between redundancy and duplication?
Redundancy refers to the inclusion of extra components to ensure system reliability, while duplication involves creating an exact copy of something. Redundancy can help prevent system failure by providing backup options, while duplication involves replicating data or information for various purposes.
Is Redundancy in databases a desirable characteristic?
yes
What kind of problems are associated with redundancy in databases?
problems associated with redundancy in data base,Redundancy occurs in same data multiple time tends to several problems some times redundancy controlling is necessary to improve the performance of the query.
Disadvantages of relational database model?
Lack of scalability: Relational databases can struggle with scalability as the data grows in size and complexity. Performance issues: Join operations and complex queries can lead to slower performance in relational databases. Data redundancy: Normalization in relational databases can result in storing data in multiple tables, leading to redundancy and inefficiency.
Characteristics of an efficient database?
Efficient databases make storing and retrieving of data fast and easy. The characteristics of such databases are, having input constraints, implementing use of unique keys for fields, avoiding data redundancy and maintaining data integrity.
What is the difference between controlled redundancy and uncontrolled redundancy?
Controlled redundancy refers to intentionally duplicating certain components in a system to ensure reliability and fault tolerance, whereas uncontrolled redundancy occurs unintentionally due to inefficient processes or lack of coordination. Controlled redundancy is planned and managed to enhance system performance, while uncontrolled redundancy can lead to inefficiencies and waste of resources.
When the same data are stored in many places?
Data redundancy
What are disadvantages of files?
File system data management (or flat-file databases) served as the only method of file storage and retrieval before the advent of database management systems (such as relational databases). While retaining some use, flat-file databases suffer from poor accessibility, data redundancy, lack of standard file access and the inability to organize data.
What is the least accurate description of relational databases Choose one answer a They minimize redundancy in data b They are made up of multiple tables c They maintain?
c They maintain hierarchical data structures. This statement is inaccurate because relational databases follow a tabular structure, not a hierarchical one.
What are three types of redundancy checks used in data communications?
coding redundancy interpixel redundancy psycovisual redundancy
What are disadvantages of file system?
File system data management (or flat-file databases) served as the only method of file storage and retrieval before the advent of database management systems (such as relational databases). While retaining some use, flat-file databases suffer from poor accessibility, data redundancy, lack of standard file access and the inability to organize data.
What are the four types of redundancy in linguistics?
The four types of redundancy in linguistics are syntactic redundancy, lexical redundancy, morphological redundancy, and phonological redundancy. These redundancies help convey meaning, aid in communication, and ensure clarity in language use.
When was The Redundancy of Courage created?
The Redundancy of Courage was created in 1991.
