How to analyze a odd column distribution

Hello everyone:

I have a table where I have a date column with historic information in
the same table, if date = '31-dec-2999' then is actual record if the
date is different of 31-dec-2999 the is an historic record. Now there
are about 5 million records and half of them are historic so there are
2.5 million records with 31-dec-2999 and it is confusing the
optimizer.

Can anybody give me any suggestion to tell the optimizer this odd
distribution? I already try using histograms and didn't get a good
execution plan and I would not like to use hints.

Thanks in advance.
-- 
Alfonso Leon
--
http://www.freelists.org/webpage/oracle-l

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