Revoke Privileges In Oracle

To revoke privileges from users in Oracle, you can use the REVOKE statement followed by the specific privileges and the object(s) from which you want to revoke those privileges.

Here's the basic syntax of the REVOKE statement:

REVOKE privilege_name

ON object_name

FROM user_name;

Where:

- privilege_name is the name of the privilege you want to revoke.

- object_name is the name of the object (table, view, etc.) from which you want to revoke the privilege.

- user_name is the name of the user from whom you want to revoke the privilege.

Example:

Suppose you want to revoke the SELECT privilege on the employees table from the user user1. You would use the following command:

REVOKE SELECT ON employees FROM user1;

This command revokes the SELECT privilege on the employees table from the user user1.

You can also revoke multiple privileges at once by listing them separated by commas:

REVOKE SELECT, INSERT, UPDATE ON employees FROM user1;

This command revokes the SELECT, INSERT, and UPDATE privileges on the employees table from the user user1.

Remember, only users with appropriate privileges (such as the DBA role) can execute the REVOKE statement.

Here are 5 frequently asked questions (FAQs) about revoking privileges from users in Oracle:

1. What is the purpose of revoking privileges in Oracle?

   - Revoking privileges allows administrators to restrict access to certain database objects or operations, enhancing security and controlling user permissions.

2. How do I revoke a specific privilege from a user in Oracle?

   - You can use the REVOKE statement followed by the specific privilege and object from which you want to revoke access, along with the name of the user.

3. Can I revoke multiple privileges from a user at once in Oracle?

   - Yes, you can revoke multiple privileges from a user at once by listing them separated by commas in the REVOKE statement.

4. What happens if I revoke a privilege from a user in Oracle?

   - When you revoke a privilege from a user, they will no longer have access to perform the specified operation(s) on the specified object(s) until the privilege is granted again.

5. Is it possible to revoke privileges from a user temporarily in Oracle?

   - Yes, privileges can be revoked temporarily by using the REVOKE statement. You can later grant the privileges back to the user when needed.