What is consistency and inconsistency in DBMS?
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What is consistency and inconsistency in DBMS?
Definition 1: Data consistency means that the changes made to the different occurrences of data should be controlled and managed in such a way that all the occurrences have the same value for any specific data item. Data inconsistency leads to a number of problems, including loss of information and incorrect results.
Why consistency is important in DBMS?
Database consistency is important because it regulates the data that is coming in and rejects the data that doesn’t fit into the rules. Consistency rules are often enforced through constraints at a field level. A constraint specifies a rule governing a given record or field-level value.
What is redundancy and inconsistency?
Data redundancy occurs when the same piece of data exists in multiple places, whereas data inconsistency is when the same data exists in different formats in multiple tables.
What are the functions of DBA Mcq?
Discussion Forum
| Que. | Which of the following in not a function of DBA? |
|---|---|
| b. | Routine Maintenance |
| c. | Schema Definition |
| d. | Authorization for data access |
| Answer:Network Maintenance |
What is consistency in database systems?
Jump to navigation Jump to search. Consistency in database systems refers to the requirement that any given database transaction must change affected data only in allowed ways. Any data written to the database must be valid according to all defined rules, including constraints, cascades, triggers, and any combination thereof.
What is the difference between data concurrency and data consistency?
Data concurrency means that many users can access data at the same time. Data consistency means that each user sees a consistent view of the data, including visible changes made by the user’s own transactions and transactions of other users.
What is data dependency in DBMS?
The term data dependency is in the context of DBMS used to refer to the phenomenon that the correct functioning of an application that uses data in a database relies on the way that this data is organised in memory and/or disk.
How does Oracle maintain data consistency in a multiuser environment?
Oracle maintains data consistency in a multiuser environment by using a multiversion consistency model and various types of locks and transactions. The following topics are discussed in this section: