Users may have some requirements, resulting in database modification.
Currently, the database is deployed, Beijing dot, set up a database,, a database, guangzhou, xi. And so on, the future plans to make a distributed system to collect data from all the databases, and now it's. The country is connected.
Now the problem is that the database changes the structure, how to synchronize it across the database, and now manually sync, the trouble is, every time I.
Even worse, some structure changes need to clean up data, process the data, and then them.
Facing n databases, updates are very cumbersome.