oracle modify sys

Oracle modify SYS user

The SYS user in the Oracle database is the highest authority user, and this user has many special permissions. Generally, it is not recommended to modify the SYS user. However, in some cases, the SYS user needs to be modified, such as resetting the SYS user password. This article will introduce how to modify the SYS user and reset the password.

Change SYS user password

In Oracle database, the password of SYS user is stored in the data dictionary table. In order to change the SYS user password, you need to perform the following steps:

1. Use the sysdba identity to connect to the database

$ sqlplus /nolog
SQL> conn / as sysdba

2 .Query the current SYS user password:

SQL> SELECT password FROM SYS.user$ WHERE name = 'SYS';

The output results are as follows:

PASSWORD

2CDD11D6B7B42D06

3. Use the ALTER USER command to change the SYS user password:

SQL> ALTER USER SYS IDENTIFIED BY NewPassword;

In this command, "NewPassword" is New password to replace the old password.

4. Query whether the SYS user password has been changed:

SQL> SELECT password FROM SYS.user$ WHERE name = 'SYS';

The output results are as follows:

PASSWORD

E10ADC3949BA59AB

The output result is encrypted in MD5 format. If the output is different from the query result in step 2, it means that the SYS user password has been successfully changed.

Please remember that the SYS user is the user with the highest authority, so changing its password may pose a potential threat to database security. Therefore, appropriate security measures must be taken to protect the database.

Change SYS user name

In addition to changing the SYS user password, you can also change its user name. To do this, you need to perform the following steps:

1. Connect to the database using sysdba identity

$ sqlplus /nolog
SQL> conn / as sysdba

2. Change SYS User's name:

SQL> UPDATE SYS.user$ SET name = 'NewUserName' WHERE name = 'SYS';

In this command, "NewUserName" is the new username. After successful execution, the original SYS user will no longer be used.

3. Create a new user with SYS permissions:

SQL> CREATE USER SYS IDENTIFIED BY Password;

In this command, "Password" is the password of the new user . Note that the new user should have the same permissions as the SYS user.

4. Grant the original SYS user permissions to the new user:

SQL> GRANT DBA TO SYS;

After executing this command, the new user will obtain all the privileges of the SYS user , including permissions to access Oracle system-level objects.

Please note that modifying the SYS user in the Oracle database involves database security. If not done correctly it can lead to security vulnerabilities so great care should be taken. It is recommended to find more information in the official Oracle documentation and related forums and follow the appropriate operating methods.

Conclusion

The SYS user in the Oracle database is the user with the highest authority and can perform any operation on the database. In some cases, it may be necessary to change the SYS user's password or name. This article describes how to change the SYS user password and name, and provides the corresponding steps. It is important to modify the SYS user carefully to avoid compromising database security.

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