Get SQL Server Service Account using T-SQL

Identify the SQL Server Service Account using T-SQL 

You can find the service account information in Services 

Go to Start --> Run --> Services.msc 

Right click on SQL Server Services and go to Properties. 

The account information is available under Log On Tab

And also service account information stored in Windows Registry, using xp_instance_regread extended stored procedure we can read windows registry.  Registry entries are like below 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSQLServer HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SQLServerAgent

Using below script also we can fetch the information   

DECLARE       @DBEngineLogin       VARCHAR(100)

DECLARE       @AgentLogin          VARCHAR(100)

EXECUTE       master.dbo.xp_instance_regread

              @rootkey      = N'KEY_LOCAL_MACHINE',

              @key          = N'SYSTEM\CurrentControlSet\Services\MSSQLServer',

              @value_name   = N'ObjectName',

              @value        = @DBEngineLogin OUTPUT

EXECUTE       master.dbo.xp_instance_regread

              @rootkey      = N'HKEY_LOCAL_MACHINE',

              @key          = N'SYSTEM\CurrentControlSet\Services\SQLServerAgent',

              @value_name   = N'ObjectName',

              @value        = @AgentLogin OUTPUT

SELECT        [DBEngineLogin] = @DBEngineLogin, [AgentLogin] = @AgentLogin

GO

Output 

in above scenario both Agent and SQL Services are running as Local System 

Using DMVS also we can fetch the information   

SELECT

      servicename

      , service_account

      , startup_type_desc

      , status_desc

      , is_clustered

FROM   sys.dm_server_services

Output :

in above scenario SQL Services is running as NT Service and Agent is running with Domain Account.