How do you view the execution plan of a query?

I want to see if a particular index was used for a specific query....

Becareful. You are in the Forum of OBIEE. It's much more a database question.
You can read an plan with a lot of tool. Toad permit it and I assume that Sql Developer also must give it.
Otherwise, you can use the basic command of Oracle as explain plan :
http://gerardnico.com/wiki/database/oracle/explain_plan
Cheers
Nico

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    Execution plan for select * from EMP where <Condtions>
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    971830 wrote:
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    select * from v$sql_plan;An absolute beautiful white paper :
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