To find the trace file for your current session:
Submit the following query:
SELECT VALUE FROM V$DIAG_INFO WHERE NAME = 'Default Trace File';
The full path to the trace file is returned.
To find all trace files for the current instance:
Submit the following query:
SELECT VALUE FROM V$DIAG_INFO WHERE NAME = 'Diag Trace';
The path to the ADR trace directory for the current instance is returned.
To determine the trace file for each Oracle Database process:
Submit the following query:
SELECT PID, PROGRAM, TRACEFILE FROM V$PROCESS;

XXXX SQL>show parameter user_dump_dest;

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
user_dump_dest                       string      /oracle/~~~~~