Looking for Oracle INDEX expert

Anyone has an idea about the difference between IndexA and IndexB and which one is recommended?
CREATE INDEX INDEX_A on TableA(Column1)
TABLESPACE indx;
CREATE INDEX INDEX_B on TableA(Column2)
TABLESPACE indx;
and
CREATE INDEX INDEX_C on TableA(Column1, Column2)
TABLESPACE indx;
How Oracle knows which INDEX to be called?

The one that is recommended, totally depends on the queries you'll be firing against your table. If the queries will be like:
select ... from TableA where Column1 = :1and
select ... from TableA where Column2 = :1then your first option is the right one. If they are:
select ... from TableA where Column1 = :1 and Column2 = :2then your second option seems right.
Note that with the second option, this index may also be used in the first two queries, if the selectivity is good enough. But again, this depends on your data and data distribution.
How Oracle knows which INDEX to be called?By using his cost based optimizer and predicting the cardinalities and the selectivity of your indexes.
Regards,
Rob.

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