A transaction is rolled back in a database system under the following circumstances:

1. Error: If an error occurs during the transaction, it will be rolled back. This is to ensure data integrity. For example, if a transaction is transferring funds from one bank account to another, and an error occurs (like insufficient funds), the transaction will be rolled back to avoid any discrepancies.

2. Manual Intervention: A user or a database administrator can manually roll back a transaction before it is committed. This is usually done when a mistake has been identified and needs to be corrected.

3. System Failure: In case of a system failure like a power cut or a hardware issue, the database management system will roll back any transactions that were not committed at the time of the failure. This is to ensure that the database remains in a consistent state.

4. Deadlock: In a situation where two transactions are waiting for each other to release resources, a deadlock occurs. The database management system detects this, rolls back one or more transactions to break the deadlock, and allows the other transactions to continue.

5. Isolation Level: Depending on the isolation level set in the database system, a transaction might be rolled back if it leads to a conflict with another transaction. For example, in the "Serializable" isolation level, if two transactions are trying to update the same row, one transaction will be rolled back to avoid a conflict.

6. Transaction Log Full: If the transaction log is full and cannot store any more data, the database management system will roll back transactions.

Question

A transaction is rolled back in a database system under the following circumstances:

1. Error: If an error occurs during the transaction, it will be rolled back. This is to ensure data integrity. For example, if a transaction is transferring funds from one bank account to another, and an error occurs (like insufficient funds), the transaction will be rolled back to avoid any discrepancies.

2. Manual Intervention: A user or a database administrator can manually roll back a transaction before it is committed. This is usually done when a mistake has been identified and needs to be corrected.

3. System Failure: In case of a system failure like a power cut or a hardware issue, the database management system will roll back any transactions that were not committed at the time of the failure. This is to ensure that the database remains in a consistent state.

4. Deadlock: In a situation where two transactions are waiting for each other to release resources, a deadlock occurs. The database management system detects this, rolls back one or more transactions to break the deadlock, and allows the other transactions to continue.

5. Isolation Level: Depending on the isolation level set in the database system, a transaction might be rolled back if it leads to a conflict with another transaction. For example, in the "Serializable" isolation level, if two transactions are trying to update the same row, one transaction will be rolled back to avoid a conflict.

6. Transaction Log Full: If the transaction log is full and cannot store any more data, the database management system will roll back transactions.

Knowee AI · Accepted Answer

A transaction is rolled back in a database system under the following circumstances:

1. Error: If an error occurs during the transaction, it will be rolled back. This is to ensure data integrity. For example, if a transaction is transferring funds from one bank account to another, and an error occurs (like insufficient funds), the transaction will be rolled back to avoid any discrepancies.

2. Manual Intervention: A user or a database administrator can manually roll back a transaction before it is committed. This is usually done when a mistake has been identified and needs to be corrected.

3. System Failure: In case of a system failure like a power cut or a hardware issue, the database management system will roll back any transactions that were not committed at the time of the failure. This is to ensure that the database remains in a consistent state.

4. Deadlock: In a situation where two transactions are waiting for each other to release resources, a deadlock occurs. The database management system detects this, rolls back one or more transactions to break the deadlock, and allows the other transactions to continue.

5. Isolation Level: Depending on the isolation level set in the database system, a transaction might be rolled back if it leads to a conflict with another transaction. For example, in the "Serializable" isolation level, if two transactions are trying to update the same row, one transaction will be rolled back to avoid a conflict.

6. Transaction Log Full: If the transaction log is full and cannot store any more data, the database management system will roll back transactions.

When is a transaction Rolled Back?

Question

Solution

Similar Questions

Upgrade your grade with Knowee