reclaim the space in the database temporarily

remove the temp and undo tablespaces and create new ones and point the database to the new tablespaces so that we can reclaim some space in the database until temp and undo get fill up.

reclaim from undo tbs
-----------------------------
CREATE UNDO TABLESPACE undotbs2 DATAFILE '/u01/app/oracle/oradata/DB11G/undotbs02.dbf' SIZE 2G AUTOEXTEND ON NEXT 1M;
ALTER SYSTEM SET UNDO_TABLESPACE=undotbs2;
DROP TABLESPACE undotbs1 INCLUDING CONTENTS AND DATAFILES;

reclaim from temp tbs
-----------------------------
CREATE TEMPORARY TABLESPACE temp2 TEMPFILE '/u01/app/oracle/oradata/DB11G/temp02.dbf' SIZE 2G AUTOEXTEND ON NEXT 1M;
ALTER DATABASE DEFAULT TEMPORARY TABLESPACE temp2;
-- Switch all existing users to new temp tablespace.
BEGIN
FOR cur_user IN (SELECT username FROM dba_users WHERE temporary_tablespace = 'TEMP') LOOP
EXECUTE IMMEDIATE 'ALTER USER ' || cur_user.username || ' TEMPORARY TABLESPACE temp2';
END LOOP;
END;
/
DROP TABLESPACE temp INCLUDING CONTENTS AND DATAFILES; --> This command may take a long time. Follow this :

SELECT b.tablespace,b.segfile#,b.segblk#,b.blocks,a.sid,a.serial#,
a.username,a.osuser, a.status
FROM v$session a,v$sort_usage b
WHERE a.saddr = b.session_addr;


alter system kill session 'SID_NUMBER, SERIAL#NUMBER';