You need to give the SharePoint Account that you plan to install and configure SharePoint with some elevated rights in SQL. Typically we recommend you use a dedicated account [Domain]\[SharePoint Admin] and this account will need the following roles on the SQL Server.
From your newly installed SQL Server click Start > All Programs > Microsoft SQL Server 2012 > SQL Server Management 2012.
After waiting this loading user settings screen will appear:
Wait for some time then the following screen appears:
Login as [Domain]\[SharePoint Admin] by selecting “Windows Authentication”:
From Object Explorer expand-out Security.
Under Security expand out Logins.
In case you don’t have the User
- Right click on Logins.
- From the menu choose New Login.
- For Login name: enter [Domain]\[SharePoint Admin] or whatever account you will be logged into SharePoint as when you do the install.
After right click, select Properties. The following screen will come:
On the left, under select a page click Server Roles.
Check the box for dbcreator and securityadmin. Also, leave public selected.
Click OK. Now your [Domain]\[SharePoint Admin] is ready to install sharepoint on the server.