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The overheads of auditing only logins/logoffs will be minimal and should have no effect on the performance of the database. Audit records are retained indefinitely until manually cleared down or purged by an automated script. This can be set to clear down data older than a month.
The audit records will include the client's hostname, oracle username, os username and the program being run, any of which can be used to track who is logging on and from where.
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