azureservicebus - What's the purpose of the "Secondary Connection String" on Azure Service Bus?

Question

I thought I could use it to implement some kind of redundancy, but the URI is almost the same as the Primary one (the only difference is the SharedAccessKey).

Answer 1

Most of the azure services like azure storage / azure iot hub / azure service bus has 2 connection strings / access keys.

The main purpose is that in some cases, if the primary connection string is revealed, you need to rotate it. At this time, to avoid downtime of you app, you can replace the primary connection string with the secondary connection string.

You can also refer to this section for more details(It's for azure storage, but it can be also used for azure service bus).