Hibernate Framework Hibernate Transactions

Question 1

How do you begin a transaction in Hibernate using the Session API?

Accepted Answer

session.beginTransaction()

Answer

session.startTransaction()

Answer

session.openTransaction()

Answer

session.newTransaction()

Question 2

What happens if you call session.flush() inside a transaction?

Accepted Answer

Hibernate synchronizes in-memory state with the database without committing

Answer

The transaction is committed

Answer

The session is closed

Answer

All cached objects are cleared

Question 3

What does transaction.commit() do in Hibernate?

Accepted Answer

Makes all changes permanent in the database and ends the transaction

Answer

Saves only a snapshot of changes

Answer

Rolls back the transaction

Answer

Flushes the session without persisting

Question 4

What is the role of transaction.rollback() in Hibernate?

Accepted Answer

Undoes all changes made since the transaction began

Answer

Saves changes partially

Answer

Closes the database connection

Answer

Triggers a second flush

Question 5

What is optimistic locking in Hibernate?

Accepted Answer

Assumes no conflict and checks version at commit time

Answer

Locks rows immediately on read

Answer

Prevents all concurrent access

Answer

Requires explicit lock statements

Question 6

What is pessimistic locking in Hibernate?

Accepted Answer

Acquires a database-level lock on rows when they are read

Answer

Checks for conflicts at commit time

Answer

Disables concurrent access entirely

Answer

Locks the entire table