Multiple Queries Slower

I am having an issue where the performance slows down drastically if i have multiple queries ( Running around 4 queries ) running at the same time. The performance is good when i have only one query running.
When i run the queries individually one after an another it takes about 10 secs for each of them to return.
When i run the queries together then it take more than a couple of minutes for all of them to return.
Any tips suggestions for any changes in oracle parameters to improve performance, when multiple queries are running at the same time. Another thing, the CPU is not being used to its full capacity. The CPU is somewhere in the 10 to 20% usage.
Thanks,
Jay.

Jayachandra, I think there is a good chance you need to tune one or more of the queries in question as they are probably running poorly using more resources than necessary. Individually they seem OK because total time is short but when combined the poor resource utilization is showing up.
If running CBO
run an explain plan on each query.
update the statistics
re-run the explain plans and look for differences
If different retime the queries, you may already be done
If not different or you spot something that looks wrong such as a full table scan where you think an index should be used then follow standard tuning practice to see what you can get.
Then once you know the SQL are as good as they are going to get look at the buffer pool to make sure it is just not too small. Many DBA just immediately make the buffer pool bigger if query performance is not good enough, however, this is usually not the correct solution and I believe you should never over-allocate resources because you might need them somewhere else.
HTH -- Mark D Powell --

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              <element name="Q6_QTY_MISSING_3" value="Q6_QTY_MISSING_3"/>
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    </dataStructure>
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           apps.per_all_people_f papf ,
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           apps.per_all_people_f papf_cre,
           apps.per_all_people_f papf_hr        
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                                    and psah.approval_history_id = psah1.approval_history_id
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       and psah.approval_history_id = (select max(psah1.approval_history_id)
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       and trunc(sysdate) between papf_cre.effective_start_date and papf_cre.effective_end_date
       and psth.last_update_date > :last_run_dateEdited by: 936671 on Jul 2, 2012 4:09 AM

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    How to Define a Data Link Between Queries

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