What is the version you are using?
Upgrade from and to versions (or) releases? or you are applying any patches?
Is it Physical or Logical standby database?
Can you help me to find the best method how to upgrade 10.2.0.4 to 126.96.36.199 with physical standby database, in my opinion :
1. Stop applying redo log
2. Stop all standby service
3. Upgrade standby
4. Switchover to upgrade standby
5. Upgrade old primary if no error in step 4
Please give any suggestion to best method and minimal downtime, and note i have more 4TB data, thank's.