Idea Please about lock...

How do set lock and unlock to the file and pls give me any sample and basic idea about lock...

What? I don't understand your question :(
Btw. Is this for a test, or homework?
/Kaj

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    Regards,
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    Sun Jan 24 10:43:41 2010
    ORA-00060: Deadlock detected. More info in file /vol01/app/oracle/admin/udump/rm
    s_ora_5185624.trc.
    Sun Jan 24 10:43:44 2010
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    s_ora_5185624.trc.
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    Many Thanks Jean-Valentin
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    Quadri

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