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  • Oracle Script to list who is using the undo space

    The script will list who is using the undo space. You will get the session id ,user name , sql id ,undoseg id , size and session status.

    SELECT substr(s.sid || ',' || s.serial#, 1, 15) SID_SERIAL,
           substr(NVL(s.username, 'None'), 1, 20) orauser,
           substr(s.program, 1, 20) program,
           substr(, 1, 20) undoseg,
           substr(t.used_ublk * TO_NUMBER(x.value) / 1024 || 'K', 1, 20) "Undo",
      FROM sys.v_$rollname    r,
           sys.v_$session     s,
           sys.v_$transaction t,
           sys.v_$parameter   x
     WHERE s.taddr = t.addr
       AND r.usn = t.xidusn(+)
       AND = 'db_block_size'
     order by s.sql_id

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