本文探讨了服务器克隆技术，确保各服务器代码库一致且不存储用户相关数据。此外，还介绍了两种数据库策略：主从复制读写分离及NoSQL数据库的特点，并讨论了缓存机制的应用场景。
Every server contains exactly the same code base and does not store any user-related data, like sessions or profile pictures, on local disc or memory.
#1 Master-slave replication: read from slaves, write to master
#2 NoSQL: No join or join by application.
#1 Cached Database Queries
#2 Cached Objects
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