The connected user is not an Analysis Services server administrator

Consider a situation where you have installed the SQL Server Analysis Services and during installation, you forget to add the Analysis Services server administrator.
When you connect to the analysis services and try to do some administrative tasks then you are presented with the error "The connected user is not an Analysis Services server administrator."

So now you do not have administrative privilege and no one is added into this rights and how to fix it?

• Start SQL Server Management Studio as administrator >> "Run as Administrator" 
• Go to "Security" Page
• Add user to the "Server Administrators" group

Change SSAS Deployment mode from multidimensional to tabular mode without reinstalling Analysis Services

It so happens that sometimes minds change easily and things needs to be done without reinstalling.
One such case is changing the Deployment mode of SSAS from multidimensional to tabular mode in SQL Server 2012.
To change the deployment mode

• Backup the multidimensional Analysis services databases on the instance (if any)
• Detach the multidimensional Analysis services databases from the instance (if any). These databases will not be usable in tabular mode
• Navigate to the path "<Install Location>:\Program Files\Microsoft SQL Server\MSAS11.MSSQLSERVER\OLAP\Config" and backup the file "msmdsrv.ini"
• Open the file "msmdsrv.ini" and change the value of DeploymentMode to 2.
  0 - Multidimensional
  1 - SharePoint
  2 - Tabular
  
• Re-Start the SQL Server Analysis services 

SSAS multidimensional mode - Before Change

SSAS tabular mode - After Change