SQLServer 2016 AlwaysOn与SQL 2017辅助副本 [英] SQLServer 2016 AlwaysOn with SQL 2017 Secondary replica

问题描述

推荐答案

AG中较低到较高的配置仅支持 作为一个部分 - 时间滚动升级过程，即如果您正在升级SQL实例而不是其他。 

The lower to a higher configuration in AG is only supported as part of a one-time rolling upgrade process i.e. if you are upgrading your SQL instances and not otherwise. 

虽然您可以将AG从低级配置为更高但是一旦故障转移，您将失去能够回退到较低版本的原始主要版本，从而最终破坏同步。

While you may be able to configure AG from lower to higher but once you failover, you would lose the ability to fall back to the lower version original primary and hence end up breaking the synchronization.

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