Restore Points can be created either as a normal restore point or a guaranteed restore point. The difference between the two is that guaranteed restore point allows you to flashback to the restore point regardless of the DB_FLASHBACK_RETENTION_TARGET initialization parameter i.e. it is always available (assuming you have enough space in the flash recovery area).
Database is in OPEN mode and FLASH BACK enabled.
* Log as SYS:
* Create a restore point :
SQL>create restore point INITDB guarantee flashback database;
In case, you are required to Flash back to the created restore point, following steps need to be followed.
* Shutdown the database :
SQL> shutdown immediate
* Statup the database (mount) :
SQL> startup mount
*You can view the created restore point :
SQL> select * from v$restore_point;
* Flashback to the restore point
SQL> flashback database to restore point INITDB;
Flashback complete.
* You can view the created restore point :
SQL>select * from v$restore_point;
Note: Check my note on Oracle flash back.
Database World 
Using this command we can restore only committed data?