Which of the following is not a proper state of a transaction?
A. Partially AbortedB. Partially Committed
C. Aborted
D. Committed
Answer: A. Partially Aborted
A transaction is a collection of instructions (or operations) that perform a single logical function.
- A transaction is a very small unit of a program and it may contain several low-level tasks.
- A transaction in a database system must maintain Atomicity, Consistency, Isolation, and Durability − commonly known as ACID properties − in order to ensure accuracy, completeness, and data integrity.
- A commit is a final step in the successful completion of a previously started database change as part of handling a transaction in a computing system.
- Until commit, all the individual operations that make up the transaction are pending
- At any point, before the transaction is committed, it might also be aborted
- If a transaction is aborted, the system will undo or rollback the effects of any individual operations which have completed.
- If an transaction is performed in a database and committed, the changes cannot take to the previous state of transaction.
The transaction states are abort, active, committed, partially committed, Failed.Partially Committed
- When a transaction executes its final operation, it is said to be in a partially committed state.
Failed
- A transaction is said to be in a failed state if any of the checks made by the database recovery system fails.
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