User permissions can be granted in Oracle database through the following methods: 1. Direct authorization; 2. Role authorization; 3. Default role; 4. System permissions.
Several methods of authorizing users in Oracle database
In Oracle database, you can use the following methods Grant user permissions:
1. Direct authorization
Use the GRANT
statement to directly grant permissions to specific users. For example:
<code class="sql">GRANT SELECT ON table_name TO user_name;</code>
This will grant the user_name
user query permissions on the table_name
table.
2. Role authorization
Create a role and grant permissions to the role. Then, assign the user to the role. For example:
<code class="sql">CREATE ROLE role_name; GRANT SELECT ON table_name TO role_name; GRANT role_name TO user_name;</code>
This will grant the user_name
user query permissions on the table_name
table granted through the role role_name
.
3. Default role
When creating a user, you can specify a default role. After the user is created, he automatically obtains the permissions of this role. For example:
<code class="sql">CREATE USER user_name DEFAULT ROLE role_name;</code>
This will grant all permissions granted to the user_name
user through their default role role_name
.
4. System permissions
System permissions grant permissions to the entire database or a specific schema. Can only be granted by users with SYSDBA
permissions. For example:
<code class="sql">GRANT CONNECT TO user_name; GRANT CREATE SESSION TO user_name;</code>
This will grant the user_name
user permission to connect to the database and create database sessions.
The above is the detailed content of What are the methods for authorizing users in Oracle database? How to implement it?. For more information, please follow other related articles on the PHP Chinese website!