What should I do if I forget my oracle sys password?

Oracle database is currently the most popular relational database management system (RDBMS) in the world. It is used by many businesses and organizations to store and manage large amounts of data. The Oracle database has a high-privilege account named "sys", which is usually used for system administrator operations. However, sometimes, due to various reasons, the administrator may forget the password of the sys user. This article will introduce some common solutions.

Method 1: Log in to the server through the command line tool

First, the administrator needs to log in to the server's command line tool (such as Linux terminal or Windows command prompt). The second step is to execute the following command:

sqlplus /nolog

This will start the SQL*Plus tool through which you can connect to the Oracle database.

In SQL*Plus, the administrator should enter the following command:

connect / as sysdba

If the administrator has set a password, the administrator should enter the password to connect to the database. If the administrator forgets their password, they can proceed to the next step.

After successfully connecting to the database, the administrator can use the following command to modify the password of the sys user:

alter user sys identified by <new_password>;

The administrator should replace with the new password they want to set, And make sure the password is strong and secure.

Method 2: Through Oracle's Enterprise Manager

Oracle's Enterprise Manager is a web application for managing enterprise-wide databases. In the installation directory of the Oracle database, you can usually find a command line tool named emctl.bat or emctl.sh. Administrators can use this tool to launch Enterprise Manager. After logging in, you need to find "Management" > "Users and Groups" > "Users" in the left menu and select the "sys" user.

To change the user's password, you need to perform the following steps:

1. Select the "sys" user on the "User" page.
2. Click the "Edit" button.
3. Find the "Password" column on the "Edit User" page, enter a new password and confirm the password again.
4. Click "Apply Changes" to save the new settings.

Method 3: Use PL/SQL to change the password through the SYSDBA identity

The administrator can also use PL/SQL (Procedural Language/SQL) to change the password of the sys user. PL/SQL is Oracle's specialized programming language for writing objects such as stored procedures and triggers.

In SQL*Plus, the administrator should follow the following steps:

1. Enter the following command:

connect / as sysdba

2. Replace the following PL/ Copy and paste the SQL code into SQL*Plus:

ALTER USER SYS IDENTIFIED BY <new_password>;

In the above code, is the new password and the administrator should replace it with a strong and secure password.

3. Click "Enter" to execute the code. If all goes well, the new password will be set to that of the sys user.

Summary

Forgetting the sys user's password is not an uncommon problem. Whether using SQL*Plus, Enterprise Manager, or PL/SQL, administrators can use different methods to change the sys user's password. However, before using these commands, make sure that you have sufficient experience and knowledge of Oracle operations. If you are unsure of the impact of your actions, first back up your database and consult a professional Oracle database administrator.

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