expire_log_days parameter value not updated?

Question

I have one MySQL RDS and i am trying to change the expire_log_days parameter value, but i'm unable to change because it's unmodified parameter. But while i am checking inside database it shows 0, Please find the below screenshot for your reference.

Why expire_log_days shows 0, Can anyone clarify me why it's happened, and also i wnat to know both are same or different parameter, as per my understanding both the parameters are same only the time units different.

Answer 1

https://dev.mysql.com/doc/refman/8.0/en/replication-options-binary-log.html says:

If a non-zero value for one of the variables binlog_expire_logs_seconds or expire_logs_days is set at startup, this value is used as the binary log expiration period. If a non-zero value for both of those variables is set at startup, the value for binlog_expire_logs_seconds is used as the binary log expiration period, and the value for expire_logs_days is ignored with a warning message.

This means it's okay for expire_logs_days to be 0. MySQL will ignore it, and use the value of binlog_expire_logs_seconds.

There is no intention that one value updates the other automatically.