Minimising throw away rows?

Friends,
I am trying to tune a query that is taking too long to return it's results.
One of the things I have noticed when looking at the explain plan is that during some parts of the execution it retrieves up to 70,000 records however the first line of the plan reads
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)|
| 0 | SELECT STATEMENT | | 6138 | 18M | | 8965 (0)|
Which I understand is the total number of records used by this query.
I know with SQL tunning that there are no hard and fast answers, however any pointers on how best to minimise the number of throw away rows would be appreciated.
Thanks in advance.

Ian,
As you mentioned, it is rather difficult to say anything, that too by looking at just one line of execution plan. Are you expecting the query to return 6138 rows as result ? Minimizing number of rows flowing out of each step is one way to look for tuning. If you are seeing 70,000 rows being flown out of some step in execution plan, that might be area to concentrate on. Is it some SORT step which is throwing out 70,000 rows ? It may be possible for you to defer the SORT by restructuring the query (ofcourse, without affecting end result). Pushing WHERE predicates i.e. filtering data as much as possible before joining or processing it further is also a an option to reduce large number of rows seen in execution plan.

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