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Oracle connection extremely slow(Oracle 11G on Linux RHEL4)

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Hi guru,
In my production database connection suddenly starts taking significant time like 10-15 seconds.

even I try to connect from same machine by using following command :

sqlplus system/impetus@DB

it is taking more then 10 seconds every time
whereas if I use follwing command :

sqlplus system/impetus
connection is instant (taking only few milliseconds)

We also used tnsping which is also instant ...

any clue
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