Codeigniter การใช้งาน sess_use_datatabse เปิดหรือไม่เปิดมีผลอย่างไรบ้างครับ

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While the session data array stored in the user's cookie contains a Session ID, unless you store session data in a database there is no way to validate it. For some applications that require little or no security, session ID validation may not be needed, but if your application requires security, validation is mandatory. Otherwise, an old session could be restored by a user modifying their cookies.