Profile in PLSQL

DECLARE 
   file_name_ VARCHAR2(1000); 
   result_ NUMBER; 
   trace_name_ VARCHAR2(1000) := 'my_trace'; 
   filename_ VARCHAR2(1000) := trace_name_||'.trc'; 
BEGIN 
   file_name_ := fnd_profiler_api.Start_Profiling(filename_); 
   --PUT_YOUR_CODE_HERE 
   result_ := fnd_profiler_api.Stop_Profiling(file_name_, trace_name_); 
   Dbms_Output.Put_Line(result_); 
END;