


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:
GRANT SELECT ON table_name TO user_name;
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:
CREATE ROLE role_name; GRANT SELECT ON table_name TO role_name; GRANT role_name TO user_name;
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:
CREATE USER user_name DEFAULT ROLE role_name;
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:
GRANT CONNECT TO user_name; GRANT CREATE SESSION TO user_name;
This will grant the user_name
user permission to connect to the database and create database sessions.
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