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Questions and Answers
Define Transaction.
Define Transaction.
A Transaction is a set of operations performed on a database, treated as a single logical unit of work, ensuring consistency and reliability even with interruptions. Transactions are essential for handling user requests to access and modify the database.
What does ACID stand for in the context of Transaction Management?
What does ACID stand for in the context of Transaction Management?
ACID stands for Atomicity, Consistency, Isolation, and Durability.
Which of these options represent operations of a Transaction?
Which of these options represent operations of a Transaction?
- Read
- Write
- Commit
- Rollback
- All of the above (correct)
Atomicity ensures that all operations within a transaction are completed successfully, or none of them are applied to the database.
Atomicity ensures that all operations within a transaction are completed successfully, or none of them are applied to the database.
Consistency guarantees that a transaction takes the database from one valid state to another, maintaining all predefined rules, constraints, and integrity conditions throughout the transaction process.
Consistency guarantees that a transaction takes the database from one valid state to another, maintaining all predefined rules, constraints, and integrity conditions throughout the transaction process.
Isolation ensures that concurrent transactions do not interfere with each other, meaning that a transaction's intermediate state is visible to other transactions.
Isolation ensures that concurrent transactions do not interfere with each other, meaning that a transaction's intermediate state is visible to other transactions.
Durability guarantees that once a transaction is committed, it will remain so, even in the event of a system failure.
Durability guarantees that once a transaction is committed, it will remain so, even in the event of a system failure.
What are the two main types of automatic commit commands?
What are the two main types of automatic commit commands?
What are the two main types of automatic rollback situations?
What are the two main types of automatic rollback situations?
What is the command to manually commit changes in SQL?
What is the command to manually commit changes in SQL?
What is the command to manually rollback changes in SQL?
What is the command to manually rollback changes in SQL?
Which of these is NOT considered a Transaction management property?
Which of these is NOT considered a Transaction management property?
Flashcards
Transaction
Transaction
A logical unit of work that includes a set of operations performed on a database. It ensures consistency and reliability by treating these operations as a single unit.
ACID Properties
ACID Properties
A set of properties designed to guarantee reliable database transaction processing. These properties ensure data integrity and consistency.
Atomicity
Atomicity
Ensures that a transaction is treated as a single, inseparable unit of work. Either all operations succeed, or none are applied.
Consistency
Consistency
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Isolation
Isolation
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Durability
Durability
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DDL Commands
DDL Commands
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DCL Commands
DCL Commands
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Automatic Commit
Automatic Commit
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Automatic Rollback
Automatic Rollback
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Study Notes
Transaction Definition
- A transaction is a set of operations treated as a single logical unit.
- Transactions ensure database consistency and reliability, handling user requests to access and modify data.
- Transactions in Database Management Systems (DBMS) are a set of logically connected operations.
Transaction Operations
- Users can perform various operations within a transaction.
- Common transaction operations include read, write, commit, and rollback.
- For instance, transferring money between accounts involves these operations.
ACID Properties of Transaction Management
- Atomicity ensures all operations within a transaction are treated as a single, indivisible unit. Either all operations succeed or none do.
- Consistency means the database maintains its integrity rules and constraints before and after a transaction.
- Isolation guarantees that concurrent transactions do not impact each other, preventing issues like dirty reads or non-repeatable reads.
- Durability ensures that once a transaction commits, its changes are permanent, even if system failure occurs.
Example Transaction: Account Transfer
- To transfer 500 from account X to account Y, a transaction involves reading X's balance, deducting 500, adding 500 to Y's balance and confirming the changes.
Automatic Commit/Rollback
- Automatic commit happens after successful execution of DDL (Data Definition Language) or DCL (Data Control Language) commands, and an exit command.
- Automatic rollback occurs upon system crashes or failures.
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Description
Test your knowledge on transactions in Database Management Systems with this quiz. Learn about key concepts including transaction operations and the essential ACID properties that ensure database reliability. Perfect for students or professionals looking to reinforce their understanding of transaction management.
