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Create login and grant access:
Open up SQL Server Management Studio [login to the database engine]>
Security >
Login (Right click) >
New Login >add user: "NT Service\MSSQLServerOLAPService">
select the database being analyzed in the drop-down list at the bottom >
User Mapping [click on the database in the list] >
In the window database role membership click on db_datareader [this grants access to read the data]
SSAS 发布报错处理方法 Login failed for user 'NT Service\MSSQLServerOLAPService' 28000
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原文地址：http://www.cnblogs.com/haseo/p/4285386.html
