DB2 performs auto rollback when a program is aborted in the middle of some transaction.

When a program aborts in the middle of a transaction in IBM Db2, the database management system automatically rolls back the incomplete transaction. This means that any changes made to the database during the transaction are undone, and the database is restored to its state before the transaction began. The rollback ensures the integrity of the database by avoiding partial or inconsistent updates in case of a program failure or abnormal termination.

In summary, the correct answer is that DB2 automatically performs a rollback when a program aborts in the middle of a transaction.