Hello. Such a question: in your experience, how much does the operation of updating the schema affect the operation of the system? Does this suspend authorization? If some relation are left out of the schema (on purpose or by mistake), what happens to the recorded tuples? Is it safe to perform such an operation a dozen times a day?

>in your experience, how much does the operation of updating the schema affect the operation of the system? it shouldn't >Does this suspend authorization? No >If some relation are left out of the schema (on purpose or by mistake), what happens to the recorded tuples? the schema write operation will fail. The API method is implemented so that it never leaves the system in an inconsistent state >Is it safe to perform such an operation a dozen times a day? It is