We deployed Debezium 2.1 oracle connector with Oracle 19c in UAT and its works fine.  but for production deployment it's required to connect to standby instance.

By connecting Debezium to oracle standby instance we faced two below issues:

1. Debezium required to call some procedures to integrate with log miner and make change in database that is not possible in standby instance.
2. Debezium can not read from standby redo log and it's required to log switch in active instance to read log from stand by.