SQL Server Database Level Roles

In SQL Server, database-level roles are predefined roles that allow administrators to manage the permissions of users within a specific database. The following are the database-level roles in SQL Server:

db_datareader: Members of this role can only read data from all tables in the database but cannot modify any data.

db_datawriter: Members of this role can both read and write data in the database but cannot modify any database structures or perform administrative tasks.

db_owner: Members of this role have full control over the database, including the ability to modify database structures, add or remove users, and perform other administrative tasks.

db_securityadmin: Members of this role can manage security-related tasks, such as creating and managing database users and roles, as well as granting and revoking permissions.

db_ddladmin: Members of this role can perform Data Definition Language (DDL) tasks, such as creating and modifying tables, indexes, and other database structures.

db_backupoperator: Members of this role can perform backup and restore operations for the database.

db_accessadmin: Members of this role can add or remove users from the database but cannot modify their permissions.

By using database-level roles, administrators can easily manage the permissions of multiple users within a specific database and ensure that they only have the necessary permissions to perform their job functions. These roles can also be customized to fit the specific needs of an organization.

The permissions assigned to the fixed-database roles cannot be changed. The following figure shows the permissions assigned to the fixed-database roles: