Monitoring other transactions

Question

Hi,
Just want to ask any work-around for this scenario. They have a proC programs being called from shell scripts thru cron, this proC scripts just loads/updates tables. Now they want to have like a log table to query if that proC code is already done modifying a table, problem is they can't touch the proC code. I have this initial code, but as I do it, I think it won't work completely like updating the status of the table to be last modified. Is there any other oracle technology I could use on this? Thanks.
drop table sys_log;
create table sys_log
( table_name  varchar2(50) constraint tn_pk primary key,
  status       varchar2(10),
  start_time  date,
  end_time    date,
  current_table    varchar2(1) default 'N'
create or replace package pkg_sys_log as
     procedure set_status( p_table_name sys_log.table_name%type );
end;
create or replace package body pkg_sys_log as
     procedure set_status( p_table_name sys_log.table_name%type ) is
                pragma autonomous_transaction;
                cursor c_sys_log( p_table sys_log.table_name%type ) is
                select table_name, current_table
                from sys_log
                where table_name = p_table;
                r_sys_log c_sys_log%rowtype;
        l_current_table sys_log.current_table%type;
     begin        
          open  c_sys_log( p_table_name );
          fetch c_sys_log into r_sys_log;
          if c_sys_log%found then                                            
       begin
           select table_name
           into l_current_table
           from sys_log
           where current_table = 'Y';                  
       exception
           when no_data_found then
              l_current_table := null;      
       end;
       if l_current_table is not null and
          r_sys_log.table_name != l_current_table then
          update sys_log
          set current_table = 'N',
              status = 'FINISHED'
              end_time = sysdate
          where table_name = l_current_table;
          update sys_log
          set current_table = 'Y'
          where table_name = r_sys_log.table_name;
       end if;                  
          else
                       insert into sys_log( table_name, status, start_time, current_table )
                       values ( p_table_name, 'ON-GOING', sysdate, 'Y' );
          end if;
          close c_sys_log;
          commit;
     exception
          when others then
               rollback;
               raise;
     end;
end;
drop table test;
create table test
as
select * from all_objects
where 1=2;
create or replace trigger bi_test_trg
before insert or update or delete on test
begin
     pkg_sys_log.set_status( 'TEST' );
end;
/

Answer 1

I see nothing what you've written that would make me think (a) I have any idea what version you are asking about or that (b) there is any reason to use Pro*C or that (c) there is any reason to use cron.
Move the code into the database using DBMS_SCHEDULER or DBMS_JOB and everything is handled with far more efficiency and only a single, simple, API and language.