A transaction typically goes through several states during its execution. Here's a step-by-step guide to drawing a state diagram and discussing these states:

1. **Active State**: This is the initial state of every transaction. In this state, the transaction is being executed.

2. **Partially Committed State**: When a transaction executes its final operation, it is said to be in a partially committed state.

3. **Failed State**: If a transaction fails to execute or if the system finds that it can no longer proceed with the execution, the transaction is moved to the failed state.

4. **Aborted State**: If a transaction is in a failed state, the recovery manager rolls back all its write operations on the database to bring the database back to its original state before the transaction was performed. The transaction is then moved to the aborted state.

5. **Committed State**: If a transaction is in the partially committed state and the system finds that there are no problems that would prevent it from proceeding, it is moved to the committed state. This means that the transaction has been executed successfully.

To draw a state diagram, you would start by drawing a circle for the active state. Then, draw arrows to the partially committed state and the failed state. From the partially committed state, draw an arrow to the committed state. From the failed state, draw an arrow to the aborted state. You can also draw an arrow from the aborted state back to the active state to represent the transaction being retried.

Remember to label all your states and arrows to clearly indicate what each one represents.

Question

A transaction typically goes through several states during its execution. Here's a step-by-step guide to drawing a state diagram and discussing these states:

1. **Active State**: This is the initial state of every transaction. In this state, the transaction is being executed.

2. **Partially Committed State**: When a transaction executes its final operation, it is said to be in a partially committed state.

3. **Failed State**: If a transaction fails to execute or if the system finds that it can no longer proceed with the execution, the transaction is moved to the failed state.

4. **Aborted State**: If a transaction is in a failed state, the recovery manager rolls back all its write operations on the database to bring the database back to its original state before the transaction was performed. The transaction is then moved to the aborted state.

5. **Committed State**: If a transaction is in the partially committed state and the system finds that there are no problems that would prevent it from proceeding, it is moved to the committed state. This means that the transaction has been executed successfully.

To draw a state diagram, you would start by drawing a circle for the active state. Then, draw arrows to the partially committed state and the failed state. From the partially committed state, draw an arrow to the committed state. From the failed state, draw an arrow to the aborted state. You can also draw an arrow from the aborted state back to the active state to represent the transaction being retried.

Remember to label all your states and arrows to clearly indicate what each one represents.

Knowee AI · Accepted Answer