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

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.

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