3.6.0 MxDB for SQL Server Installation and Administration Guide (5697-7088, December 2007)

Chapter 3: Install SQL Server Instances 26
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Service Accounts. You will need to create an account that will be used for
SQL Server and SQL Server Agent. System accounts are required to be
Domain user accounts. We recommend that you use the same Domain
account for all instances so that privileges will be consistent across the
matrix. To create the SQL Server account, select “Customize the settings
for each service” and then select SQL Server in the Services column. Do
not check the “Auto Start Service” box.