oracle change user password

Oracle database is an enterprise-level relational database management system and one of the most commonly used databases in the industry. In Oracle, in order to ensure the security of the database, a strong password must be set for the user when creating it. However, in actual applications, password forgetting, leakage, or other reasons may lead to the need to change the password. So how to change user password in Oracle? This article will introduce how to change user passwords in Oracle.

First of all, it needs to be explained that there are four ways to change user passwords in Oracle. They are:

1. Use the SQL command ALTER USER to modify.

2. Use the SQL commands GRANT and PASSWORD to modify.

3. Use the SQL*Plus command line interface to modify.

4. Use Oracle unified user management tool to modify.

These four methods will be introduced below.

1. Use the SQL command ALTER USER to modify

ALTER USER syntax:

ALTER USER username IDENTIFIED BY new password;

ALTER USER command can be modified A user's username and password, and other attributes of the user. The IDENTIFIED BY clause is used to modify the user's password.

The following is an example:

ALTER USER scott IDENTIFIED BY tiger;

or

ALTER USER scott IDENTIFIED BY "1qaz!QAZ2wsx@WSX";

When executing this command, Oracle will check whether the new password is strong or weak. If the new password is not strong enough, Oracle will give a warning message but will not prevent the change. If the password is too short or too simple, you can force it by adding double quotes to the password.

2. Use SQL commands GRANT and PASSWORD to modify

GRANT syntax:

GRANT ALTER USER TO username;

PASSWORD syntax:

PASSWORD New password;

The steps are as follows:

(1)Grant the user ALTER USER system permissions.

GRANT ALTER USER TO scott;

(2) Log in as user scott.

SQL> CONNECT scott/tiger

(3) Modify the password of user scott.

SQL> PASSWORD "1qaz!QAZ2wsx@WSX";

Note: To use GRANT and PASSWORD to modify the user password, the user must first be granted the system permission of ALTER USER.

3. Use SQL*Plus command line interface to modify

SQL*Plus is a command line interface tool provided by Oracle, which can manage Oracle databases. The following are the steps to change the user password:

(1) Log in to SQL*Plus using the administrator account.

SQL> CONNECT sys/administrator password @orcl AS SYSDBA;

(2) Switch to the user who needs to change the password.

SQL> ALTER SESSION SET current_schema=user;

(3) Modify the user password.

SQL> PASSWORD "1qaz!QAZ2wsx@WSX";

The advantage of using SQL*Plus is that modification operations can be completed quickly and easily, but administrator rights are required.

4. Use Oracle unified user management tool to modify

Oracle provides a tool called unified user management, which can manage all Oracle users. With this tool, passwords can be changed and managed in a single interface. The following are the steps for changing the user password using the unified user management tool:

(1) Start the unified user management tool.

(2) Select the user who needs to change the password.

(3) In the user editing interface, enter the new password.

(4)Save changes.

Using the unified user management tool can easily complete the password modification work for a large number of users, avoiding the cumbersome operations caused by using SQL statements or SQL*Plus.

Summary

In this article, we introduced four different ways to modify user passwords in Oracle, including using the SQL command ALTER USER to modify, using the SQL commands GRANT and PASSWORD to modify, and using SQL* Plus command line interface modification and modification using Oracle Unified User Management Tool. Each of these four methods has its own advantages and disadvantages. Which method to choose depends on actual needs. Different users can choose the method that suits them according to their own circumstances.

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