今天仔细差了一下SQL Sever中各种role的定义，记录备查
Predefined database roles
You may need to create your own, but you have access to several predefined database roles:
- db_owner: Members have full access.
- db_accessadmin: Members can manage Windows groups and SQL Server logins.
- db_datareader: Members can read all data.
- db_datawriter: Members can add, delete, or modify data in the tables.
- db_ddladmin: Members can run dynamic-link library (DLL) statements.
- db_securityadmin: Members can modify role membership and manage permissions.
- db_bckupoperator: Members can back up the database.
- db_denydatareader: Members can’t view data within the database.
- db_denydatawriter: Members can’t change or delete data in tables or views.
Fixed roles
The fixed server roles are applied serverwide, and there are several predefined server roles:
- SysAdmin: Any member can perform any action on the server.
- ServerAdmin: Any member can set configuration options on the server.
- SetupAdmin: Any member can manage linked servers and SQL Server startup options and tasks.
- Security Admin: Any member can manage server security.
- ProcessAdmin: Any member can kill processes running on SQL Server.
- DbCreator: Any member can create, alter, drop, and restore databases.
- DiskAdmin: Any member can manage SQL Server disk files.
- BulkAdmin: Any member can run the bulk insert command.
Reference: http://www.techrepublic.com/article/understanding-roles-in-sql-server-security/1061781