about find unused users in oracle database

HI,

I'm wondering is there any simple way to find unused oracle users for
a period of time ? ( which has not logged into the oracle database for
some period time ).

I found we could enable audit connect or create logon/logoff trigger
to find those info.

But is there any simple way ( like record login info in oracle
database somewhere )

Thanks very much for any suggestion on it.

.

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