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Grant access to Oracle trace and dump files

Oracle Database Tips by Donald BurlesonApril 28,  2015

Oracle now has many ways to gat external filesystem information (alert logs, etc.) from inside Oracle so that you do not have to physically sign-on to the server.

Oracle guru Laurent Schneider (author of Advanced Oracle SQL programming) offers this great tip for granting access to external trace and dump files from within Oracle.

One to grant access to an external trace file is to use the hidden parm _trace_files_public=true, but this is undocumented and unsupported.

I prefer to provide a PL/SQL function that reads from the trace directory.

Ok, here we go, a PL/SQL function to see the contents if an external dump file from inside Oracle.


CREATE DIRECTORY user_dump_dest AS
  '/app/oracle/admin/DB01/udump';

CREATE OR REPLACE FUNCTION get_tracefile (file_name VARCHAR2)
   RETURN VARCHAR2
IS
   dest_loc   CLOB;
   src_loc    BFILE;
   ret        VARCHAR2 (4000);
BEGIN
   src_loc := BFILENAME ('USER_DUMP_DEST', file_name);
   DBMS_LOB.OPEN (src_loc, DBMS_LOB.lob_readonly);
   DBMS_LOB.createtemporary (dest_loc, TRUE);
   DBMS_LOB.loadfromfile (dest_loc, src_loc, 4000);
   ret := DBMS_LOB.SUBSTR (dest_loc, 4000);
   DBMS_LOB.CLOSE (src_loc);
   RETURN ret;
END;
/

Just a small function that returns the first 4000 characters of the trace file. I could then grant execute on that function to the developers.

it works quite well

SELECT get_tracefile ('db01_ora_6224.trc')
  FROM DUAL;
GET_TRACEFILE('DB01_ORA_6224.TRC')                                      
----------------------------------------------------------------------
/app/oracle/admin/DB01/udump/db01_ora_6224.trc
 . . . 

 

 

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