Windows Shared Hosting:
You cannot create MS SQL database with unlimited size in Windows Shared Hosting, as you will get 500 MB storage space for each MS SQL database.

Windows VPS Hosting:
In Windows VPS Hosting, maximum database size depends on the MS SQL Server edition you have chosen. In Windows VPS, we offer (i) MS SQL Server Express Edition and; (ii) MS SQL Server Web Edition. You have the option to choose either of them at the time of placing your order.

MS SQL Server 2012 R2 / 2014 / 2016 Express Edition:
The permissible DB size is up to 10 GB data.

MS SQL Server Web Edition:
The permissible DB size is up to 524 PB.