Asking for some guidance for a performance problem

Hello,
We found some very slow sql queries, and they all share one pattern, large query number in trace file.
For example:
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 150 0.05 0.09 0 0 0 0
Fetch 300 442.38 464.74 170 86428872 0 150
total 460 442.43 464.83 170 86428872 0 150
a. 300 Fetch to get only 150 rows back
b. 170 disk visits, 86428872 consistent reads
Since it is a complicate application (indexes/stats are all up-to-date), I just want to ask for some general guidance for investigating the problem.
1. What/where should I look for?
2. Any possible explanation for the huge query number?

query = consistent gets = making the result set consistent
It could be because the query runs a long time and thus has to read from the undo alot.
Can you give us a peek at the sql and plan? I'd imagine it's doing some full table scans. If it's OLTP sql then you might be able to get a better plan, but if it's a report that's scanning every row in a table you might be stuck with it.

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