How to minimize I/O in a Table

Hi,
I have this table in a Fin (PeopleSoft) database, it's size is 11 million rows.
Actually, the thing is anytime we run query or billing on this table it generates a lot of I/O and it's the biggest table and the most important in the database.
Could someone gimme some advice on how to reduce I/O on this table?
Thanks.
Regards!
Texas!

You can join the corresponding v$ views for current time explain plan.
Alternately, you can use the following query. Add the where clause to filter by snap_id and /or object_owner. The Opeartion column will show you the FTS.
Select
trim(sql_id),
trim(id),
trim(plan_hash_value),
operation||' '||options||decode(id, 0, substr(optimizer,1, 10)||' Cost='||to_char(cost)) "Operation",
object_name,
object_owner,
cost,
cardinality,
round(bytes/1024) kbytes
from DBA_HIST_SQL_PLAN natural join dba_hist_snapshot Natural join dba_hist_sqlstat

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