How does the system deal with real-world data that has cross-datum consistency requirements? Many system mnodeling real-world have this issue: accounting, inven

How does the system deal with real-world data that has cross-datum consistency requirements? Many system mnodeling real-world have this issue: accounting, inventory, ... I'm also annoyed by the repeated mantra that you must have partition tolerance. In fact, most naïve systems are designed without it, with some central authority that must always be accessible. (Any system that is stricly a tree with an essential root node is like that. Any partition that does not include the root node cannot do any work, thus the system is not partition tolerant.) You can then have CA (by requiring that all requests and updates must propagate to the root.)