Index for very small tables needed ?

Hi,
do i need to define an index on small tables ? I'm confused after reading different articles about this. One tells me i should define an index the other says there is no need, as a full table scan is fast enough.
Also other articles say, oracle does not read rows in the buffer cache while doing a Full table scan. So i think, next time this table will be accessed there is another need of doing io. So now, whats best ?
No Index with Full table scan and io's
or
Having an Index, so rows may stay in buffer ?

Any Ideas ?
Thanks a lot.

Andreas Wizemann Received on Thu Dec 27 2001 - 02:23:19 CST