The log of upgrade actions are in these files:
Enterprise Controller: /var/opt/sun/xvm/update-saved-state/update_EC_minor_bundle_12.2.n.xxxx/updatelog.txt
Co-located Proxy Controller: /var/opt/sun/xvm/update-saved-state/update_PC_minor_bundle_12.2.n.xxxx/updatelog.txt
Remote Proxy Controller: /var/scn/update-saved-state/update_proxy_bundle_12.2.n.xxxx/updatelog.txt
If an upgrade fails, the database rolls back and a log of database actions is stored in the following directory: /var/opt/sun/xvm/update-saved-state/update_EC_minor_bundle_12.2.n.xxxx/dblogs directory.