oracle sys change password

Oracle is a widely used database management system. As a database administrator (DBA), you often need to manage and maintain the Oracle system. One of the very basic operations is to change the password of the sys user in Oracle. This article will use this as the theme to introduce how to change the password of the sys user in Oracle.

The sys user is the default administrator account of the Oracle database. When the database is created, two users, sys and system, are generally created. Among them, the sys user has the highest authority of the Oralce database and can manage and operate various databases. Therefore, it is crucial to ensure the password security of sys users.

The following will introduce how to change the password of the sys user in Oracle:

1. If the sys user is currently logged in to the database, you can use the following SQL statement to change the password:

alter user sys identified by 新密码;

This is the simplest method. If you have logged in to the database, you can immediately use the above command to change the password of the sys user. After changing your password, you need to log in again with your new password.

2. If you do not have the password for the sys user, you need to log in as another administrator user first, and then use the following command to log in as sysdba:

sqlplus / as sysdba

In After entering the command, the system will prompt you to enter the password of the administrator user. After entering, you can enter the sysdba mode.

3. After entering sysdba mode, you can use the following SQL statement to modify the password of the sys user:

alter user sys identified by 新密码;

It should be noted that after changing the password, you must use the following statement Exit sysdba mode:

exit;

It should be noted that this method only changes the password of the sys user. If you change the password for the first time or want to update the passwords of all administrator accounts, you need to perform the above After the operation, use the following statement to confirm whether the passwords of users such as sys, system, sysman, etc. are consistent:

select username, account_status from dba_users where username in ('SYS', 'SYSTEM', 'SYSMAN');

If a user's password is inconsistent with other users, then the user's password needs to be modified separately.

Summary:

It is actually very simple to change the sys user password in Oracle. You only need to use the alter user statement and log in as sysdba. However, when changing the password, you need to pay attention to ensuring the security of the administrator account, and also pay attention to the consistency of the passwords of each administrator account. I hope this article can help you in Oracle database management.

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