记录系统是否应该复制到不同的系统？

Question

我是一个客户主系统，用于存储，更新和检索客户信息。服务调用大约为300-600毫秒。显然它是记录系统。

我正在设计另一个需要客户主信息的促销系统。我想知道促销系统是否应该在每次需要客户主信息时调用客户主系统，还是应该保留数据库副本并尝试定期与客户主系统同步？

Answer 1

With any replication method, there would be a chance of serving stale data. Hence it would depend if the application using the replicated SOR does get affected with the occasional stale data or not.

Also, I am not sure how big this customer data set is. Have you considered using a cache with LRU or a similar policy on it ?