I've a requirement like my database needs to be accessed to a limited users. Then how can I restrict the instance access to those users ?.. Any help will be appreciated.
Restricted mode startup limits access to only users with DBA permission, it's designed for maintenance, not security. To start a restricted instance, use the command:
To limit access to certain users, just use the normal Oracle access control. First, ensure that your users all have their own username/password, if they're sharing access credentials, you can't tell them apart so can't control access. Then you can just unlock or lock the accounts of people you want to allow or deny access:
ALTER USER scott ACCOUNT LOCK; ALTER USER scott ACCOUNT UNLOCK;
Beyond that, you can get more sophisticated and control access to different objects within the database.
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