Modify oracle sys password

In the Oracle database, the sys user has the highest authority, so the importance of the sys password is self-evident. For database administrators, it is often necessary to change the password of the sys user to ensure system security. This article will introduce how to change the sys password in Oracle database.

1. Log in to the Oracle database

Before changing the sys password, you first need to log in to the Oracle database. You can log in using SQL Plus or any other tool that supports connecting to Oracle databases.

2. Stop the Oracle instance

Before changing the sys password, you need to stop the Oracle instance. You can stop the Oracle instance by running the following command:

SQL> shutdown immediate;

3. Start the Oracle instance to the mount state

After stopping the Oracle instance , you need to start it into the mount state. You can start an Oracle instance by running the following command:

SQL> startup mount;

4. Modify the password file

You need to modify the Oracle password file to update sys The user's password. You can open the password file for editing by running the following command:

$ORACLE_HOME/dbs/orapw$ORACLE_SID

After opening the password file, you can find the entry for the sys user and reset its password. Set as new password. Please note that the passwords in the password file must be stored in ciphertext.

5. Start the Oracle instance and log in as sysdba

You can start the Oracle instance and log in as sysdba by running the following command:

SQL> startup;
SQL> conn / as sysdba;

6. Change sys password

Now that you have logged in to the Oracle instance as sysdba, you can run the following command To modify the sys password:

SQL> alter user sys identified by new password;

where the new password is the new password you want to set.

7. Restore the Oracle instance

After changing the sys password, you need to restore the Oracle instance. This can be done by running the following command:

SQL> shutdown immediate;
SQL> startup;

Now, the password of the sys user in the Oracle database has been changed to the new password . Please note that system administrators should regularly change the password of the sys user and ensure the security of the password file to ensure database security.

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