How to change the user in oracle

This article will introduce how to change users in Oracle database.

1. Log in to the Oracle database

First, you must log in to the Oracle database. You can use SQL*Plus, SQL Developer or any other Oracle SQL client.

2. Query users

Before changing the user, you need to query the current existing users. The current user can be queried through the following SQL:

SELECT username FROM dba_users;

This query will return a list of all database users including system users.

3. Change user password

The most common reasons for changing Oracle users are password expiration or the need to change the password. The user password can be changed through the following SQL:

ALTER USER username IDENTIFIED BY new_password;

where username is the username whose password is to be changed, and new_password is the new password.

4. Change user default table space

When a user creates a new table or index, they will be stored in the default table space. You can change the user default table space through the following SQL:

ALTER USER username DEFAULT TABLESPACE new_tablespace;

where username is the user name to change the default table space, and new_tablespace is the name of the new table space.

5. Change user temporary table space

Oracle database uses temporary table space to handle sorting and hashing operations. You can change the user temporary table space through the following SQL:

ALTER USER username TEMPORARY TABLESPACE new_temp_tablespace;

where username is the user name to change the temporary table space, and new_temp_tablespace is the name of the new temporary table space.

6. Change user quota

You can limit the available space of a user in Oracle. Quotas can be set for users through the following SQL:

ALTER USER username QUOTA {integer | UNLIMITED} ON tablespace_name;

Among them, username is the user name to change the quota, integer is the limit of the space used by the user, UNLIMITED means no limit, tablespace_name is the name of the table space.

7. Change user roles

Oracle database uses roles to provide users with encapsulated access levels. The user role can be changed through the following SQL:

GRANT role_name TO username;

where role_name is the name of the role to be granted, and username is the user name to change the role.

Through the above methods, many attributes of Oracle users can be easily changed. Before changing user properties, be careful and make sure you understand the impact of the change.

The above is the detailed content of How to change the user in oracle. For more information, please follow other related articles on the PHP Chinese website!