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Error: Login failed error when executing first dimension

Symptoms

When you execute the first dimension of your cube you get the following error:

OLE DB error: OLE DB or ODBC error: Login failed for user 'domain\username'.; 28000; Cannot open database "DWH" requested by the login. The login failed.; 42000. Errors in the high-level relational engine. A connection could not be made to the data source with the DataSourceID of 'DWH', Name of 'DWH'. Errors in the OLAP storage engine: An error occurred while the dimension, with the ID of 'Dimension', Name of 'Dimension' was being processed. Errors in the OLAP storage engine: An error occurred while the 'Dimension Level' attribute of the 'Dimension' dimension from the 'OLAP' database was being processed. Internal error: The operation terminated unsuccessfully. Server: The operation has been cancelled.

Cause

The user that runs the SQL Server Analysis Services service does not have sufficient rights to access the data warehouse, which it needs to process the cubes.  The default user name in MSSQL 2016 is NT Service\MSOLAP$MSSQLSERVER16, the default name in earlier versions is NT Service\MSSQLServerOLAPService.

Resolution

To resolve this you have to give at least db_datareader to the user that the Analysis Services Service is running as on the data warehouse. To find out which user this is do as follows:

  1. Start -> Run -> Services.msc
  2. Locate the service with the display name: SQL Server Analysis Services (...)
  3. Locate the username in the Log on as column, this is the username that needs permissions on the data warehouse.

Then add the user rights to the data warehouse:

  1. Open SQL Server Management Studio.
  2. Expand the Security node, Expand Logins, if the username from the errormessage above exists in the list, right click and Properties. Otherwise right click Logins, "New Login..." and type in the correct Login Name:
  3. On the "User Mapping" tab check the data warehouse Map checkbox and select db_datareader for it.
  4. Click OK
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