Transaction processing refers to the controlled execution of database operations as a single logical unit of work.
Transaction Processing Overview
A transaction may include multiple SQL statements—such as INSERT, UPDATE, or DELETE—but the system treats them as one combined action.
Purpose:
The goal is simple: ensure the database remains correct, consistent, and reliable even when many users access it at the same time. Transaction processing protects data from errors, failures, or incomplete operations.
Key Idea:
A transaction must either complete fully or not at all. This guarantees predictable, error-free data behavior across the system.
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Transaction States Overview
A database transaction does not execute instantly—it moves through a well-defined set of states from start to finish.
Purpose:
These states help the DBMS manage execution, detect problems, and ensure the correct commit or rollback of changes.
Key Idea:
- Active → Transaction is running
- Partially Committed → Final statement executed, waiting for validation
- Committed → Changes are permanently saved
- Failed → An error occurred
- Aborted → System rolls back all changes
- Terminated → Transaction fully ends
These states ensure every transaction follows a predictable, safe lifecycle.
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ACID Properties Overview
The ACID properties define the reliability standards for every transaction, ensuring that data remains correct and stable.
Purpose:
ACID ensures the database behaves consistently even during failures, crashes, or concurrent user activity.
Key Idea:
- Atomicity: All-or-nothing execution
- Consistency: Database moves from one valid state to another
- Isolation: No transaction interferes with others
- Durability: Results survive system failures
Together, these rules guarantee trustworthy transaction processing.
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