How to modify oracle user name

In Oracle database management, sometimes it is necessary to modify the user name of the database user. This situation usually occurs in some unauthorized situations, such as: the user leaves the company or changes his name, etc. In this case, the administrator needs to change the username. The following are the steps and precautions for modifying the Oracle user name.

1. Create a new user

In order to modify the Oracle user name, you first need to create a new user. This new user must have the same permissions and roles as the old user. You can use the CREATE USER statement to create a new user, as shown below:

CREATE USER newusername IDENTIFIED BY password;

Please ensure that the new user's password is strong and cannot be easily guessed. If you already have a strong password and don't need to change it, continue by following the steps below.

2. Assign the new user the role of the old user

After completing the creation of the new user, you now need to associate the new user with all database roles owned by the old user . You can use the following statement to associate the new user with the old user's role:

GRANT CONNECT, RESOURCE, DBA TO newusername;

Note: If the old user has more roles or permissions, Make sure to assign it to the new user as well.

3. Modify the old user's schema

If the old user's schema number and user name are the same, then you need to perform the following steps to change its schema:

ALTER USER username RENAME TO newusername;

ALTER USER newusername DEFAULT TABLESPACE users;

where username is the old username, newusername is the new username, and users is the default table for new users space.

If the old user's schema number and username are different, you will need to change their schema before you can change their username. The following is the statement to change the old user schema:

ALTER USER oldschema RENAME TO newschema;

ALTER USER username IDENTIFIED BY newpassword;

ALTER USER newschema IDENTIFIED BY newpassword;

Among them, username is the old username, newpassword is the new password, oldschema is the schema number of the old user, and newschema is the schema number of the new user.

4. Delete the old user

After completing the above steps, you need to delete the old user and revoke all roles and permissions associated with it. The following is the statement to delete a user and his permissions/roles:

REVOKE DBA FROM username;

REVOKE RESOURCE FROM username;

REVOKE CONNECT FROM username;

DROP USER username CASCADE;

Note: Make sure you have backed up the old user's data before deleting it. It can also be transferred to the new user's schema if needed.

Summary:

In the Oracle database, modifying the user name can be achieved by creating a new user, associating it with the old user's roles and permissions, and changing the old user's schema. Finally, deleting the old user requires revoking all roles/permissions associated with it and backing up or moving their data into the new user's schema.

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