Patching Grid Infrastructure and RDBMS to 19.31 on Exadata Cloud@Customer (ExaCC)

A step-by-step runbook for upgrading Grid Infrastructure and the RDBMS Oracle Home to 19.31.0.0.0 (April 2026 RU) on ExaCC using dbaascli — with prechecks, rolling GI patching, an out-of-place database move, and a documented rollback path.