What is two-phase commit protocol in the context of transaction management?
- A protocol for authentication
- A protocol for coordination
- A protocol for data retrieval
- A protocol for voting
The two-phase commit protocol is a coordination protocol involving a voting phase and a decision phase to ensure distributed transaction consistency.
How do savepoints work within a transaction?
- Allow for partial rollback
- Commit the entire transaction
- Isolate a transaction
- Terminate the transaction
Savepoints allow for partial rollback within a transaction, providing a way to undo part of the transaction without affecting the entire operation.
In SQL, the command ________ is used to permanently save changes made by the current transaction.
- BEGIN TRANSACTION
- COMMIT
- ROLLBACK
- SAVEPOINT
The COMMIT command in SQL is used to permanently save changes made by the current transaction.
The ability of a transaction to operate independently of other transactions is known as __________.
- Atomicity
- Consistency
- Durability
- Isolation
The ability of a transaction to operate independently of other transactions is known as Isolation.
A transaction's property ensuring that either all its operations are completed successfully, or none are, is known as _________.
- Atomicity
- Consistency
- Durability
- Isolation
A transaction's property ensuring that either all its operations are completed successfully, or none are, is known as Atomicity.
A transaction in a financial application requires updating multiple accounts. If one update fails, what should happen to ensure data consistency?
- Commit the successful updates
- Ignore the failed update and proceed
- Log the failure and retry the update
- Rollback the entire transaction
In a financial application, to ensure data consistency, it's crucial to rollback the entire transaction if any update within it fails. This helps maintain the integrity of the financial data.
The isolation level that allows neither dirty reads nor non-repeatable reads is called _________.
- Read Committed
- Read Uncommitted
- Repeatable Read
- Serializable
The Serializable isolation level ensures neither dirty reads nor non-repeatable reads, providing the highest level of isolation.
The concept of ________ allows multiple users to make changes to the database without affecting each other.
- Concurrency Control
- Consistency Management
- Isolation
- Transaction Control
The concept of Concurrency Control allows multiple users to make changes to the database concurrently without affecting each other, ensuring data integrity and consistency.
In a distributed system, when two databases must be updated as part of a single transaction, which transaction management technique is most appropriate?
- Isolation (I)
- Optimistic Concurrency Control (OCC)
- Pessimistic Concurrency Control (PCC)
- Two-Phase Commit (2PC)
The Two-Phase Commit (2PC) is most appropriate for managing transactions in a distributed system involving updates to multiple databases, ensuring atomicity and consistency across the distributed environment.
How should a system handle a situation where a transaction is interrupted due to a system failure?
- Commit the partial updates
- Ignore the interruption and proceed
- Retry the interrupted transaction
- Rollback the interrupted transaction
If a transaction is interrupted due to a system failure, the system should rollback the interrupted transaction to maintain consistency and avoid partial updates that could lead to data inconsistencies.