在Oracle 11g版本前查询如下：

select d.value||'/'||lower(rtrim(i.instance,chr(0)))||'_ora_'||p.spid||'.trc' trace_file_name
from
(select p.spid
from sys.v$mystat m,sys.v$session s,sys.v$process p
where m.statistic# = 1 and s.sid = m.sid and p.addr = s.paddr) p,
(select t.instance from sys.v$thread t,sys.v$parameter v
where v.name = 'thread' and (v.value = 0 or t.thread# = to_number(v.value))) i,
(select value from sys.v$parameter where name = 'user_dump_dest') d
/

Oracle 11g版本开始简单多了如下

   v$diag_info

select value from v$diag_info from v$diag_info where name='Default Trace'

更多Oracle相关信息见 专题页面

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