An undo log is a database mechanism that records changes made to the data to allow for the reversal of transactions, ensuring data consistency and integrity in case of failures. It plays a critical role in transaction management by enabling rollback operations and maintaining atomicity, one of the ACID properties.

Undo Log

undo log

database mechanism

changes made to the data

reversal of transactions

Data consistency ensures that data remains accurate and reliable across a system, preventing discrepancies and errors during data processing and retrieval. It is crucial for maintaining data integrity, especially in distributed systems where multiple sources may update the same data concurrently.

data consistency

Data integrity refers to the accuracy, consistency, and reliability of data throughout its lifecycle, ensuring that it remains unaltered and trustworthy for decision-making and analysis. It is crucial for maintaining the credibility of databases and information systems, and involves various practices and technologies to prevent unauthorized access or corruption.

Data Integrity

failures

Transaction management is a critical component in database systems that ensures transactions are processed reliably and ensures data integrity despite system failures. It encompasses a set of techniques to control concurrent access, maintain consistency, and ensure atomicity, isolation, and durability of transactions.

transaction management

rollback operations

Atomicity is a fundamental principle in database systems that ensures a series of operations within a transaction are completed entirely or not at all, maintaining system integrity. This guarantees that even in the event of a system failure, no partial updates are applied, thus preserving data consistency.

atomicity

ACID properties are a set of principles that ensure reliable processing of database transactions, maintaining data integrity even in cases of errors, power failures, or other mishaps. They stand for Atomicity, Consistency, Isolation, and Durability, each representing a crucial aspect of transaction management in database systems.

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