What is the result of rolling back transactions after starting the SAP HANA database?

When rolling back transactions after starting the SAP HANA database, the primary objective is to ensure data consistency. A rollback is utilized to reverse transactions that may have either been incomplete or potentially harmful to the integrity of the database state.

During a rollback, the database reverts any changes made by transactions that were either not fully committed or encountered errors. This process is critical for maintaining a reliable and consistent state of the database, as it effectively undoes changes that could lead to discrepancies or data corruption. By ensuring that only complete and valid transactions are accepted, the rollback mechanism safeguards the accuracy of the data contained within the database.

The other options do not accurately reflect the outcomes of a rollback. For instance, while it may seem intuitive to think that lost transactions could refer to transactions that failed, the focus of a rollback extends further to maintain overall data integrity rather than simply addressing failed transactions. The notion that all transactions are lost is misleading, as rollbacks specifically target uncommitted or problematic transactions rather than all transactions in the session. Finally, rolling back transactions does not inherently speed up database start-up; rather, it serves a critical purpose in managing data integrity.