5 Questions
What is Concurrency Control in a DBMS?
Coordinates the simultaneous execution of transactions in a multiprocessing database system while preserving data integrity
What is a Lost Update in concurrency control?
A concurrency control problem in which a data update is lost during the concurrent execution of transactions
What is Uncommitted Data in concurrency control?
A concurrency control problem in which a transaction accesses uncommitted data from another transaction
What does Inconsistent Retrieval refer to?
Retrieving data that is not consistent with the database state at a particular point in time
What is the primary function of Concurrency Control in a DBMS?
To coordinate the simultaneous execution of transactions while preserving data integrity
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.
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.
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