输入一些文字 

15:50:08 sys@TQGZS> select FILE# ,NAME,BYTES from v$datafile where FILE#=1;

     FILE# NAME                                                    BYTES
---------- -------------------------------------------------- ----------
         1 /u01/oracle/oradata/tqgzs/system01.dbf              734003200

引用一下

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SELECT    d.VALUE
       || '/'
       || LOWER (RTRIM (i.INSTANCE, CHR (0)))
       || '_ora_'
       || p.spid
       || '.trc' trace_file_name
  FROM (SELECT p.spid
          FROM v$mystat m, v$session s, v$process p
         WHERE m.statistic# = 1 AND s.SID = m.SID AND p.addr = s.paddr) p,
       (SELECT t.INSTANCE
          FROM v$thread t, v$parameter v
         WHERE v.NAME = 'thread'
           AND (v.VALUE = 0 OR t.thread# = TO_NUMBER (v.VALUE))) i,
       (SELECT VALUE
          FROM v$parameter
         WHERE NAME = 'user_dump_dest') d
/

a1 b1
100 200