主从模式是最基础的模式，配置简单，主要用于数据备份和读写分离，提高系统的读取性能。但是，主从模式无法处理主节点故障的情况。
Cologne's persons are recognized for their liberalism and joie de vivre; it’s easy to possess a very good time with them within the beer halls of the Altstadt or in the course of Carnival.
Lutheranism is robust from the japanese and northern elements with a lot of totally free churches. Münster and especially Paderborn are thought of as Catholic. Osnabrück is divided Virtually equally involving Catholicism and Protestantism.
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As the strength of the Roman empire declined, many of read more such tribes came to generally be witnessed collectively as Ripuarian Franks website and they pushed ahead together both banks from the Rhine, and by the end in the fifth century experienced conquered all of the lands that experienced formerly been click here under Roman impact.
不能自动切换，如果主节点发生故障，从节点不能自动切换为主节点，需要人工干预；
Via the eighth century, the Frankish dominion was firmly established in western Germany and northern Gaul, but concurrently, on the north, Westphalia was remaining taken around by Saxons pushing south.
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主节点发生故障后，新的主节点可能会有一段时间的数据不一致，影响数据的准确性。