Sql Server express edition for OPManager repository and WMI credentials permissions.

Sql Server express edition for OPManager repository and WMI credentials permissions.

Hi there,
I woluld like to ask if it is possible to use SQL Server Express Edition for OPManager(v.11.4) Repository?
And what permissions do I need to grant to WMI Credentials user to monitor WMI performance counters for a group of servers. Do I have to include that WMI credentials user to
specific group(like backup operators or something) on each server?

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