在自定义的函数上建立function-based索引；

SQL> create index idx_001 on a(func_ib(comoon));

create index idx_001 on a(func_ib(comoon))

                          *

ERROR at line 1:

ORA-30553: The function is not deterministic

--------------增加关键字deterministic

create or replace function func_ib (v_comoon varchar2)
return varchar2 deterministic is
v_var1 varchar2(8);
begin
v_var1:=upper(v_comoon);
  return v_var1;
  end;

SQL> create index idx_001 on a(func_ib(comoon));

Index created.