Rbo + history data index/no index table (cast ())

Hi guys,
I have couple of questions and maybe you can help me with some advices.
I have the misfortune to work with a 10g system that works on RBO.
1. and I have a lot of tables containing activity per id.
for example:
i have a table like: moved_history
lets say I have 100 k ids in system, and each month there are some ids moved (lets say 20 k rows. an Id can be moved multiple types.
so each month we will add extra 20k lines to this table. most of my queries are accessing this type of table with a predicate like entry_date between sysdate and sysdate - 2 months(or 1.5 months or 1 month).
I have a lot of tables like this: change_history, pay_history...etc
the question: it is Ok to create an index on entry_date. at the beginning this will not be useful, because it will select entire table using the index. but after a lot of months, this index will start to be usable?!.(I am using RBO and oracle it is using it no matter what)
2.(second question)
let’s say a have a table called dummy: ~100k records.
a part of it ~80k it is used multiple times in selects in a pl/sql process.
Initially I select with bulk collect and put those 80k(or in other case 10K or 1k) rows in nested tables.
after that I use in sql the nested table, instead of using the table (with table(cast (.....)).
Is this a correct approach?
What are the advantages and the disadvantages.
When using the nested table, I dont have any index on it(although I want to access all rows from that nested table and a full scan will be best), any statistics on it (in case, at some point I will move on CBO :) ), I use memory from PGA.
When using the table directly, oracle knows the date, I am using SGA, maybe the data from table is cached, so the access speed will be the same like the one with nested tables.
please correct me if I am wrong.
How can I test/benchmark this? what should I look at?
there is another option. the solution depends on how I will join, access, select from tables? and again, how can I test this in a good way.
thanks guys for your time

Well it is a bit hard to say. Someone has decided to go with a desupported optimizer
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/glossary.htm#sthref1601
>
Note:
This feature has been desupported.
>
And since the optimizer is responsible for the efficient execution of queries
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/sqlplsql.htm#sthref3528
>
All SQL statements use the optimizer, a part of Oracle that determines the most efficient means of accessing the specified data.
>
I can only deduce that they do not care about optimization or query efficiency and that unfortunately your hands are pretty much tied.

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Hi,
You asked: „Why do you want to do that?”
Well, I have a table T with fields F1, F2, F3 ...
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select F2, F1 from T where F1=12345;
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And this is the same record. Oppps!!!!!
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I have an index on F1, F2 named ndx_T_F1_F2
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But what is strange, oracle didn’t realise this inconsistent situation.
(It could be an earlier crash, I don’t know, I’m new at this workplace)
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But it’s a very special situation for me, and I would like to see the corrupted data concretly with my eyes.
I think, that
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It would be enough to me, because I only could see the data in the index.
But it is impossible as you wrote, isn’t it?
Thanx: lados.

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2. If the index is unique, use a global index. If this is the case, you are finished. If this is not the case, continue to guideline 3.
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My program collects 5 pieces of information per object from user. Some of the input data is in String format, rest are Integers. I create an object from this data and put in into a table. My table contains max 10 pieces of information.
I have editing options for this data, which are erase one or all pieces, or modify a piece. I erase data by simply setting the index to null. Erasing one piece is incomplete atm, here's why:
Say I have 5 pieces in table, and I erase the one with index of 0. I can't print my information because the table starts with a null value:
int index = 0;
if (table[index] != null) { System.out.println(data);} ..
My guess is that I can solve this problem by decreasing the index of pieces greater than the modified one by 1. I can imagine that I'll be using for loop here. This is where I run out of ideas: is it possible to just modify the index, or do I have to rewrite the data again?
Any help is appreciated,
br,
nomi

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I'm filling the table as simply as:
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