Data Scraping Encyclopedia>Data Scraping Noun> Database Transaction

Database Transaction | Web Scraping Tool | ScrapeStorm

2025-05-28 17:30:01

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Abstract：A database transaction is a mechanism that combines a series of database operations into a single unit and reflects the results only if all operations succeed. ScrapeStormFree Download

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Introduction

A database transaction is a mechanism that combines a series of database operations into a single unit and reflects the results only if all operations succeed. This mechanism is extremely important, especially in systems where multiple operations are interrelated or must maintain strict consistency. The basic principle of transactions is the “ACID property (atomicity, consistency, isolation, durability)”, which ensures that data integrity is maintained even in the event of unexpected interruptions or errors.

Applicable Scene

Transactions are mainly used in situations where multiple operations must succeed, such as bank transfers, inventory updates, and e-commerce purchases. For example, when withdrawing money from one account and depositing it into another, if any one of the operations fails, there will be inconsistent balances. To avoid this, transactions can be used to ensure that both operations are performed reliably. In addition, even in batch processing involving data modification, deletion, and insertion, if an error occurs during processing, the changes can be undone, thereby achieving reliable data operations.

Pros: The biggest advantage of database transactions is that they ensure data integrity and consistency. By using transactions, you can prevent the database from being left in an unfinished or half-finished state, regardless of the state of the system. This is a powerful protection measure, and even if a network failure or system crash occurs, you can roll back all ongoing data changes and restore to a stable state before the failure. In addition, it can prevent data conflicts and read inconsistencies in a multi-user environment (multiple users accessing the database at the same time).

Cons: On the one hand, transactions will occupy system resources, especially in a concurrent environment. The simultaneous execution of multiple transactions may lead to fierce resource competition and reduce the overall performance of the system, just like multiple cars rushing to cross a narrow bridge, causing congestion. On the other hand, improper setting of transaction isolation level can easily lead to problems such as dirty reads, non-repeatable reads, and phantom reads, destroying data consistency. It may also block other transactions due to long-running transactions, causing slow system response and affecting user experience.