Accessing variables in Trigger (e.g. NoTransaction, NoInserts)

Question

Hi,
I have a table where a process writes n DELETEs and m INSERTs. The commit is called at the end of the process, and lets call this commit a transaction (trx1). I have a trigger set on the table that fires when either a DELETE or INSERT occurs.
I am looking for a way in the trigger to get the following info:
1) Total number of inserts and deletes = n + m
2) Unique id for trx1. I need this unique id to be able to differentiate the transactions.
Any tips would be very very helpful!!

Answer 1

May be something like:
SQL> create table trace_tab as select * from dual where rownum < 1;
&nbsp
Table created.
&nbsp
SQL> create or replace package my_pkg
  2  is
  3    l_del_count integer;
  4    l_ins_count integer;
  5    tx_del_count integer;
  6    tx_ins_count integer;
  7    txi varchar2(30) := '-1';
  8  end;
  9  /
&nbsp
Package created.
&nbsp
SQL> create or replace trigger bud_emp_copy
  2  before insert or delete on trace_tab
  3  declare
  4   new_txi varchar2(30) := DBMS_TRANSACTION.LOCAL_TRANSACTION_ID;
  5  begin
  6   if my_pkg.txi != new_txi then
  7     my_pkg.tx_del_count := 0;
  8     my_pkg.tx_ins_count := 0;
  9     my_pkg.txi := new_txi;
10   end if;
11   my_pkg.l_del_count := 0;
12   my_pkg.l_ins_count := 0;
13  end;
14  /
&nbsp
Trigger created.
&nbsp
SQL> create or replace trigger audfer_emp_copy
  2  after insert or delete on trace_tab
  3  for each row
  4  begin
  5    if deleting then
  6     my_pkg.l_del_count := my_pkg.l_del_count + 1;
  7    else
  8     my_pkg.l_ins_count := my_pkg.l_ins_count + 1;
  9    end if;
10  end;
11  /
&nbsp
Trigger created.
&nbsp
SQL> create or replace trigger aud_emp_copy
  2  after insert or delete on trace_tab
  3  begin
  4  if DBMS_UTILITY.FORMAT_ERROR_STACK is null then
  5     my_pkg.tx_del_count := my_pkg.tx_del_count + my_pkg.l_del_count;
  6     my_pkg.tx_ins_count := my_pkg.tx_ins_count + my_pkg.l_ins_count;
  7  end if;
  8  end;
  9  /
&nbsp
Trigger created.
&nbsp
SQL> insert into trace_tab select rownum from emp where rownum < 11;
insert into trace_tab select rownum from emp where rownum < 11
&nbsp                                    *
ERROR at line 1:
ORA-12899: value too large for column "SCOTT"."TRACE_TAB"."DUMMY" (actual: 2,
maximum: 1)
&nbsp
&nbsp
SQL> insert into trace_tab select rownum from emp where rownum < 10;
&nbsp
9 rows created.
&nbsp
SQL> begin
  2   dbms_output.put_line('Inserted ' || my_pkg.tx_ins_count || ' rows ');
  3   dbms_output.put_line('Deleted ' || my_pkg.tx_del_count || ' rows');
  4  end;
  5  /
Inserted 9 rows
Deleted 0 rows
&nbsp
PL/SQL procedure successfully completed.
&nbsp
SQL> delete from trace_tab where rownum < 4;
&nbsp
3 rows deleted.
&nbsp
SQL> begin
  2   dbms_output.put_line('Inserted ' || my_pkg.tx_ins_count || ' rows ');
  3   dbms_output.put_line('Deleted ' || my_pkg.tx_del_count || ' rows');
  4  end;
  5  /
Inserted 9 rows
Deleted 3 rows
&nbsp
PL/SQL procedure successfully completed.
&nbsp
SQL> /* New transaction */
SQL> commit;
&nbsp
Commit complete.
&nbsp
SQL> delete from trace_tab where rownum < 2;
&nbsp
1 row deleted.
&nbsp
SQL>  begin
  2    dbms_output.put_line('Inserted ' || my_pkg.tx_ins_count || ' rows ');
  3    dbms_output.put_line('Deleted ' || my_pkg.tx_del_count || ' rows');
  4   end;
  5   /
Inserted 0 rows
Deleted 1 rows
&nbsp
PL/SQL procedure successfully completed.Rgds.