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SYS@LSC01> select sequence# from v$log where status='CURRENT';
SEQUENCE#
----------
4
SYS@LSC01> alter system switch logfile;
System altered.
SYS@LSC01> select sequence# from v$log where status='CURRENT';
SEQUENCE#
----------
5
SYS@LSC01> select DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
157166
SYS@LSC01> select DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER from dual;
GET_SYSTEM_CHANGE_NUMBER
------------------------
157167 |