Just a very simple one - to log the access.
LU_ACCOUNT is the table name.
TABLE_CONTROL is the control table.

create or replace trigger LA_lu_account_trg
after insert or update or delete
on lu_account
begin
update table_control set last_access = sysdate where tab_name = 'LU_ACCOUNT';
end;

Table_control
SCH_NAME VARCHAR2(20)
TAB_NAME VARCHAR2(30)
LAST_ACCESS DATE
TAB_DROPPED CHAR(1)