Ho do i check bcz of which query's the dead locks happend in 11g

Hi,
I am working on 11g database and recently dead locks happend and it's released it's fine. But i need to know becz of which query's the dead locks happend and who fired those query's.
i hope we can get these info from trace file i opend trace file but am fully confusing how do i know all these details. Can any one help me on this...
Thanks in advance
Regards

Check
How to find where is deadlock?

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Ho do i check bcz of which query's the dead locks happend in 11g

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