Clean up processing required by SHUTDOWN NORMAL during the shutdown process is just as fast as recovery processing caused to the subsequent startup as a result of a SHUTDOWN ABORT.

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This statement is true. During a SHUTDOWN NORMAL, clean up processing is performed to ensure that all transactions are completed and resources are released properly before the database is closed. This clean up processing can take a similar amount of time as the recovery processing required during a subsequent startup after a SHUTDOWN ABORT, where the database was not closed properly and recovery is needed to bring it back to a consistent state.

Clean Up Processing Required by SHUTDOWN NORMAL During the Shutdown