https://userapps.support.sap.com/sap/support/knowledge/en/2461970
2461970 - Error: "DBSQL_NO_MORE_CONNECTION: No resources available for further secondary database...
During the upgrade of a NetWeaver system to version 7.5, the following error occurs: SAPup broke during phase UVERS_UP_S in module MAIN_NEWBAS / Downtime II:...
no more