Fire trigger once when inserting 50 rows

Question

Is there a way to fire a trigger once after inserting several rows in a table within a single transaction.
I dont want the overhead of firing the trigger for each row.

Answer 1

Here is something dirty, but works!
Works with regular inserts.
SQL> select * from emp1;
no rows selected
SQL> create or replace package emp1_pkg as
  2  v_emp_inserts number := 0;
  3  end emp1_pkg;
  4  /
Package created.
SQL> create or replace trigger emp1_tgr
  2  before insert
  3  on emp1
  4  begin
  5       emp1_pkg.v_emp_inserts := emp1_pkg.v_emp_inserts + 1;
  6       if emp1_pkg.v_emp_inserts > 5 then
  7          dbms_output.put_line ('Trigger fired');
  8          emp1_pkg.v_emp_inserts := 0;
  9       end if;
10  end;
11  /
Trigger created.
SQL> set serveroutput on
SQL> insert into emp1 values ('a', 1);
1 row created.
SQL> insert into emp1 values ('b', 2);
1 row created.
SQL> insert into emp1 values ('c', 3);
1 row created.
SQL> insert into emp1 values ('d', 4);
1 row created.
SQL> insert into emp1 values ('e', 5);
1 row created.
SQL> insert into emp1 values ('f', 6);
Trigger fired
1 row created.
SQL> insert into emp1 values ('g', 7);
1 row created.
SQL> select * from emp1;
ENAME            ENUM
a                   1
b                   2
c                   3
d                   4
e                   5
f                   6
g                   7
7 rows selected.