SQL Server Level Roles and Description

Server Level Roles	Rights
Bulkadmin	Can execute BULK INSERT statements
Dbcreator	Create, alter, and drop databases
Diskadmin	Manage disk files
Processadmin	Manage processes running in SQL Server
Securityadmin	Manage logins and CREATE DATABASE permissions, also read error logs and change passwords.
Serveradmin	Set server-wide configuration options, also shut down the server; alter endpoints
Setupadmin	Manage linked servers and startup procedures
Sysadmin	Can perform any activity in SQL Server