----------------------------------------
-- Add logfile members
----------------------------------------
set serveroutput on size unlimited
BEGIN
		FOR i in (
     SELECT 'alter database add logfile member ''+DATA_DM02_EXT'' TO GROUP ' || l.group# sqltext
          , l.status
       FROM v$log l
        JOIN v$logfile lf ON lf.group# = l.group#
     WHERE l.members = 1
     group by l.group#, l.status
     ORDER BY l.group#
		)
		LOOP
      dbms_output.put_line(i.sqltext || ';');
      --	execute immediate i.sqltext;
		END LOOP;
END;
/



--------------------------------------------------
-- Switch logfiles for newly added log members
--------------------------------------------------
set serveroutput on size unlimited
BEGIN
		FOR i in (
       SELECT 'alter system archive log instance ''' || i.instance_name || ''' current' sqltext  
            , lf.status
         FROM v$log l
              JOIN v$logfile lf ON lf.group# = l.group#
          JOIN gv$instance i ON i.inst_id = l.thread#
         WHERE lf.status = 'INVALID'		 
       ORDER BY l.group#, i.instance_name
		)
		LOOP
     dbms_output.put_line(i.sqltext || ';');
     --	execute immediate i.sqltext;
		END LOOP;
END;
/



--------------------------------------------------
-- Drop logfiles
--------------------------------------------------
set serveroutput on size unlimited
BEGIN
		FOR i in (
      SELECT 'alter database drop logfile member ''' || lf.member || '''' sqltext
            , l.status
        FROM v$log l
         JOIN v$logfile lf ON lf.group# = l.group#
      WHERE l.members = 2
        and l.status NOT IN ('CURRENT')
        and lf.member like '+RECO_DM02_EXT%'
      ORDER BY l.group#
		)
		LOOP
     dbms_output.put_line(i.sqltext || ';');
     --	execute immediate i.sqltext;
		END LOOP;

		FOR i in 	(
      SELECT 'alter database drop logfile member ''' || lf.member || '''' sqltext
        , 'alter system archive log instance ''' || i.instance_name || ''' current' sqltext2  
        , l.status
        FROM v$log l
         JOIN v$logfile lf ON lf.group# = l.group#
         JOIN gv$instance i ON i.inst_id = l.thread#
      WHERE l.members = 2
        and lf.member like '+RECO_DM02_EXT%'
        and l.status = 'CURRENT'
      ORDER BY l.group#, i.instance_name
		)
		LOOP
     dbms_output.put_line(i.sqltext2 || ';');
     --	execute immediate i.sqltext2;
     dbms_output.put_line(i.sqltext || ';');
     -- execute immediate i.sqltext;
		END LOOP;
END;
/