Hi,
The instruction in the link seems pretty clear and only thing that you need to find out is the database name which could be OperationsManager but you can clarify this from your SCOM admin/team.
Make sure server firewall and infrastructure firewall (if any) rule allow on the database server that accepts connections from the QRadar server specificed in target event collector field in the log source configuration where you have created the JDBC log source. Open TCP port 1433 (default) or whichever port the SQL Server is accepting connection on. https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-a-windows-firewall-for-database-engine-access
If you haven't tried that out, I would suggest that you go ahead and create the log source and it should work.
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