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What are the methods for authorizing users in Oracle database? How to implement it?

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Release: 2024-04-19 02:42:48
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User permissions can be granted in Oracle database through the following methods: 1. Direct authorization; 2. Role authorization; 3. Default role; 4. System permissions.

What are the methods for authorizing users in Oracle database? How to implement it?

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>
Copy after login

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>
Copy after login

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>
Copy after login

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>
Copy after login

This will grant the user_name user permission to connect to the database and create database sessions.

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