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A transaction may be in one of the following states during its execution life cycle in a concurrent execution environment: A. FAILED B. TERMINAT
Question



A transaction may be in one of the following states during its execution life cycle in a concurrent execution environment:
A. FAILED
B. TERMINATED
C. PARTIALLY COMMITTED
D. COMMITTED
E. ACTIVE
Given a transaction in the active state during its execution, find its next transitioned state from the options given below:

A.

A only

B.

Either A or C only

C.

C only

D.

D only

Correct option is B


When a transaction is in the active state, its next possible transition depends on its execution outcome. If an error occurs during execution, it transitions to the failed state (A). If it executes successfully, it transitions to the partially committed state (C).
Information Booster
1. Transaction States:
· Active State: The initial state of a transaction where it is being executed.
· Partially Committed State (C): Reached when a transaction completes its final statement successfully, but before ensuring the data is written permanently to the database.
· Failed State (A): Entered when a transaction cannot complete due to errors (e.g., system crash, logical error).
· Committed State (D): Reached after a transaction’s changes are permanently written to the database.
· Terminated State (B): The final state after a transaction ends successfully (commit) or fails and rolls back.
2. Possible Transitions:
· From Active State, the transaction can:
· Transition to Failed State (A) if it encounters an error.
· Transition to Partially Committed State (C) if it successfully executes all instructions.
Additional Knowledge
· ACID Properties: Ensure transaction consistency, particularly in the event of system crashes or concurrent execution.
· Concurrency Control: Helps manage the state transitions of multiple transactions to avoid conflicts.
· Real-world applications of transaction states include database operations in banking, reservations, and e-commerce systems.
· A only: Incorrect because the transaction can also transition to the partially committed state.
· C only: Incorrect because a transaction might fail and transition to the failed state.
· D only: Incorrect because a transaction does not directly transition from active to committed; it must first enter the partially committed state.

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