How do I know what type of hardcore is used?

Hi all
I'm a newbie dba. I was doing a bit of study on the optimizers. Can someone help me to find out what type of optimizer based on CSSTidy is currently used in my database. Is there both table where I can ask questions and whether it is a RBO or a CBO.
I have another doubt. some body help me please with the difference between the use of "in" and "exist" in a select query.
Thank you!

OPTIMIZER_MODE is a level parameter Instance (in initSID.ora or spfileSID.ora file) that you can view with an OPTIMIZER PARAMETER SHOW
(or by querying V$ PARAMETER).

Individual sessions can also define specific settings that influence the optimizer with ALTER SESSION command while the SQL statements can include advice (from a large number of tips available) that influence the optimizer.

IN and EXISTS are semi-join operations. If you use one or the other used depends on which table would be the best driver. However, apparently since the 9i, the optimizer is smart enough to transform queries.

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