At the end of step Preprocessing before the start of roadmap step Execution, you are prompted to stop all work in the SAP system.

You have to be able to recover the database to the state it has at this point in time.

At the beginning of roadmap step Execution, you can deactivate the archiving of the database.

If you deactivate archiving, you have to make a full backup of the database before and after the downtime before you switch archiving back on. This has to be executed as an offline backup.

For a detailed description on deactivating and activating the archiving of the database, see Changing the Oracle Database Recovery Mode.