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Table lock and 'un index foreign key constraint’ related issues on oracle 11g

Last Modified: 2015-02-27
I wonder what it mean by below issue based on the oracle 11g database report
Table lock on aaa _bbb table  ‘un index foreign key constraint’ related issues. It forced to restart all production jvms and close the database connections and restablish them which blocked all the production users for couple of hours. Why table lock happens. what are root causes to debug and how to avoid them our application written mainly on java j2ee using other technologies as well
Please advise.
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