Guido Neitzer wrote:
> That makes no sense if it works with non-bound variables. You need the
> statistics for both ...
> 

No you don't statistics for executing a query.
In absence of them the Rule Based Optimizer was used in releases
prior to 10g. I'm not sure about 10g's behaviour.

In this case statistics are probably incomplete: not available for
all necessary columns or not for all indexes. Or some indexes are missing.
On the other hand low cardinality column "Is_option_contract" can
confuse the optimizer.

Of course without knowledge about that particular table we can only
guess.

-- 
Wiktor Moskwa
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