What is Function based Index and which type of function we can use in Function b

What is Function based Index and which type of function we can use in Function base index.
can we use aggregate,NVL function in Function based Index..

Question Posted / dinesh

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What is Function based Index and which type of function we can use in Function base index. can we u..

Answer / dinesh

Its not batter to modify where clause column with function(Performance issue). So we need to create function based index. Eg.
Create Index Fun_indx on EMP (UPPER(FIRST_NAME).
we can't create function based index on aggregate function.
but we can create NVL function as function.
also we can create function based index on user define function but function should be"DETERMINISTIC".
eg
create or replace function fun_index(a in number) Return
Number DETERMINISTIC IS
BEGIN
'''
,,,
END;

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