问题
I have noticed that SQL Agent does not start automatically after a reboot/shutdown on a few of our servers (SQL server starts up fine). The service is set to automatically start in windows. When we start SQL agent manually, it starts fine.
回答1:
Add your windows level user in following path:
Click on Start - Run - Secpol.msc
Go to: Local Policies - User right assignments
Ensure the user account your running the SQL Agent Service under has the following assignments:
Act as a part of the Operating system
bypass Traverse checking
Lock pages in memory
Log on as a service
Log on a batch job
Replace process level token
If not, please add them and try restarting your system. Your SQL Server should be now be automatically starting as a service.
来源：https://stackoverflow.com/questions/25619950/sql-server-agent-not-starting-automatically-on-server-reboot