Specifies the system change number (SCN) that Export will use to enable flashback. The export operation is performed with data consistent as of this specified SCN.
Oracle Database Backup and Recovery User's Guide for more information about performing flashback recovery
The following is an example of specifying an SCN. When the export is performed, the data will be consistent as of SCN
> exp FILE=exp.dmp FLASHBACK_SCN=3482971