本文介绍了数据库级别的固定角色，包括db_accessadmin、db_backupoperator等，并解释了这些角色如何被管理和使用。只有db_owner角色成员可以向db_owner角色添加成员。
Database-Level Roles
Fixed database roles are defined at the database level and exist in each database. Members of thedb_owneranddb_securityadmindatabase roles can manage fixed database role membership; however, only members of thedb_ownerdatabase role can add members to thedb_ownerfixed database role.
The fixed database roles are the following:
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