Differences between function based index and normal index

Hi,
Please Give me some differences between function based index and normal indexes.
1. Is there any performance gain in function based index?
2. Why indexes created in DESC are treated as function based?
3. Every DESC index is b-tree index?
Thanks

check this link. This would give u a basic idea of what a function based index is .
http://www.oracle-base.com/articles/8i/FunctionBasedIndexes.php
--Prasad

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jverd wrote:
The first two answers were also correct.Also the blocked message, quoted here for posterity:
"Tinkerbell" wrote:
Methods are defined by Java whereas functions are not. ~

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ranitB wrote:
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18 /
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JIM
BOB
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SQL> ed
Wrote file afiedt.buf
1 create or replace function f_dname(p_deptno in number) return varchar2 is
2    v_dname varchar2(10);
3 begin
4    select dname into v_dname
5    from   dept
6    where deptno = p_deptno;
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8* end;
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SQL> /
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