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 select member from v$logfile;
 desc v$log
 select status from v$log;
 select member from v$logfile;
 select archive form v$instance;
archive log list;
alter system checkpoint;
select member from v$logfile;
 select group#,status,members from v$log;
select group# from v$log;
select * from v$logfile;
 select members from v$log;