Oracle Data Guard under SAP — what SAP actually permits, which is narrower than Oracle's own documentation: physical standby only (logical is forbidden), the Broker, the three protection modes and the Maximum Protection trap that terminates the primary, Fast-Start Failover (permitted but unsupported), Active Data Guard and Far Sync licensing, and the read-only rule that blocks starting an SAP instance on a standby. Covers the DGMGRL command surface, BR*Tools interaction and standby backups. Use for "Oracle Data Guard SAP", "physical standby", "DGMGRL", "switchover", "failover", "Maximum Availability", "ORA-16724", "is Data Guard supported by SAP".