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Concurrency Control in Database Management Systems Quiz

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Concurrency Control in Database Management Systems Quiz

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What is Concurrency Control in a DBMS?

Manages the storage of data in a database system
Ensures that only one transaction can execute at a time
Ensures that data is consistent across different databases
Coordinates the simultaneous execution of transactions in a multiprocessing database system while preserving data integrity (correct)

What is a Lost Update in concurrency control?

An error that occurs when two transactions deadlock
A problem arising from excessive data replication
A situation where a transaction is unable to access the database
A concurrency control problem in which a data update is lost during the concurrent execution of transactions (correct)

What is Uncommitted Data in concurrency control?

A concurrency control problem in which a transaction accesses uncommitted data from another transaction (correct)
Data that has been lost due to a system failure
Data that is locked and cannot be accessed by any transaction
Data that is inconsistent across different databases

What does Inconsistent Retrieval refer to?

<p>Retrieving data that is not consistent with the database state at a particular point in time (D)</p> Signup and view all the answers

What is the primary function of Concurrency Control in a DBMS?

<p>To coordinate the simultaneous execution of transactions while preserving data integrity (B)</p> Signup and view all the answers

Study Notes

Concurrency Control in DBMS

Concurrency Control is a DBMS mechanism that handles simultaneous access to the database by multiple transactions, ensuring database consistency and integrity.

Concurrency Issues

Lost Update: occurs when two or more transactions update the same data item, and one transaction overwrites the changes made by the others, causing data inconsistency.
Uncommitted Data: refers to the data modified by a transaction that has not yet been committed, which may be accessed by other transactions, leading to inconsistencies.
Inconsistent Retrieval: occurs when a transaction retrieves inconsistent data due to concurrent updates by other transactions.

Primary Function of Concurrency Control

The primary function of Concurrency Control is to ensure that database transactions are executed reliably, maintaining data consistency and integrity, and preventing concurrency issues.

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Description

Test your knowledge of concurrency control in database management systems with this quiz. Explore concepts such as coordinating simultaneous transaction execution and preserving data integrity. Identify and understand common issues such as lost updates.