SQL Server Permissions of Fixed Database Roles

The following table describes the mapping of the fixed database roles to permissions.

Fixed database role	Database-level permission	Server-level permission
db_accessadmin	Granted: ALTER ANY USER, CREATE SCHEMAGranted with GRANT option: CONNECT	Granted: VIEW ANY DATABASE
db_backupoperator	Granted: BACKUP DATABASE, BACKUP LOG, CHECKPOINT	Granted: VIEW ANY DATABASE
db_datareader	Granted: SELECT	Granted: VIEW ANY DATABASE
db_datawriter	Granted: DELETE, INSERT, UPDATE	Granted: VIEW ANY DATABASE
db_ddladmin	Granted: ALTER ANY ASSEMBLY, ALTER ANY ASYMMETRIC KEY, ALTER ANY CERTIFICATE, ALTER ANY CONTRACT, ALTER ANY DATABASE DDL TRIGGER, ALTER ANY DATABASE EVENT, NOTIFICATION, ALTER ANY DATASPACE, ALTER ANY FULLTEXT CATALOG, ALTER ANY MESSAGE TYPE, ALTER ANY REMOTE SERVICE BINDING, ALTER ANY ROUTE, ALTER ANY SCHEMA, ALTER ANY SERVICE, ALTER ANY SYMMETRIC KEY, CHECKPOINT, CREATE AGGREGATE, CREATE DEFAULT, CREATE FUNCTION, CREATE PROCEDURE, CREATE QUEUE, CREATE RULE, CREATE SYNONYM, CREATE TABLE, CREATE TYPE, CREATE VIEW, CREATE XML SCHEMA COLLECTION, REFERENCES	Granted: VIEW ANY DATABASE
db_denydatareader	Denied: SELECT	Granted: VIEW ANY DATABASE
db_denydatawriter	Denied: DELETE, INSERT, UPDATE
db_owner	Granted with GRANT option: CONTROL	Granted: VIEW ANY DATABASE
db_securityadmin	Granted: ALTER ANY APPLICATION ROLE, ALTER ANY ROLE, CREATE SCHEMA, VIEW DEFINITION	Granted: VIEW ANY DATABASE
dbm_monitor	Granted: VIEW most recent status in Database Mirroring Monitor Important The dbm_monitor fixed database role is created in the msdb database when the first database is registered in Database Mirroring Monitor. The new dbm_monitor role has no members until a system administrator assigns users to the role.	Granted: VIEW ANY DATABASE

Fixed database roles are not equivalent to their database-level permission. For example, the db_owner fixed database role has the CONTROL DATABASE permission. But granting the CONTROL DATABASE permission does not make a user a member of the db_owner fixed database role. Members of the db_owner fixed database role are identified as the dbo user in the databases, but users with the CONTROL DATABASE permission, are not.