If you can't select an AZ, it means that there are no resources in this AZ. You can choose another AZ as displayed on the actual purchase page, which will not affect your use of the read-only instance.
Yes. When creating a read-only instance, you can choose to create a new RO group for it and select an AZ different from that of the source instance. However, if you select an existing RO group, the AZ of the new read-only instance can only be the same as that of the selected existing RO group, which may not necessarily be the same as that of the source instance.
Read-only instances can be connected via public and private networks.
After sync is enabled and initial sync is completed, the source instance and disaster recovery instance will sync data in real time.
This operation is currently not supported.
If the number of tables in a single instance exceeds one million, upgrade may fail and database monitoring may be affected. Make sure that the number of tables in a single instance is below one million.
For this purpose, you can purchase disaster recovery instances in the TencentDB for MySQL console.
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