Oracle Database Discussions

hi all

try to play with flashback and try to find min available value for scn

so

select * from v$version where rownum=1
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production  

get current scn

SELECT current_scn FROM v$database; 
12347182

and for table

  SELECT versions_xid, versions_startscn, versions_starttime, versions_endscn, versions_endtime, versions_xid, versions_operation, t.*
     FROM DS_MASTER 
     VERSIONS BETWEEN SCN 12347182 AND 12347182
     t
5 йцукен 01.09.2017
2 new text 2 01.09.2017
3 text 3 01.09.2017
4 text 4 01.09.2017
1 new text 1 01.09.2017

try to get minimal value for scn ( looks like it's not minimal value but no idea what it is )

SELECT oldest_flashback_scn FROM  v$flashback_database_log;
12246557

and data beggining from it

SELECT versions_xid, versions_startscn, versions_starttime, versions_endscn, versions_endtime, versions_xid, versions_operation, t.*
     FROM DS_MASTER 
     VERSIONS BETWEEN SCN 12246557 AND 12347182
     t 
"invalid lower limit snapshot expression"

there is some predefined values minvalue , maxvalue

SELECT versions_xid, versions_startscn, versions_starttime, versions_endscn, versions_endtime, versions_xid, versions_operation, t.*
     FROM DS_MASTER 
     VERSIONS BETWEEN SCN minvalue AND maxvalue
     t 
5 йцукен 01.09.2017
2 new text 2 01.09.2017
3 text 3 01.09.2017
4 text 4 01.09.2017
1 new text 1 01.09.2017

so how to correctly get min ( and may be max) value for scn to exclude possibility for "invalid lower limit snapshot expression" ?

thanks