How to turn on maintenance mode through SQL in Microsoft Dynamics 365 F&SCM

In order to turn on maintenance mode in Microsoft Dynamics 365 F&SCM through SQL, the following steps needs to be performed:

1. Open Microsoft SQL Server Management Studio 
2. Connect to the Server
3. Expand AxDB database and execute the following script

update SQLSYSTEMVARIABLES SET VALUE = 1 where PARM = 'CONFIGURATIONMODE'

       See the result of the update:

select * from SQLSYSTEMVARIABLES

    After update, execute iisreset command in cmd. 

    To return back execute the following query:

update SQLSYSTEMVARIABLES SET VALUE = 0 where PARM = 'CONFIGURATIONMODE'