If the business requires greater availability but read consistency is not a premium, then an asynchronous option may be a more cost-effective approach.
如果业务要求更高的可用性，并且读一致性不是很重要，那么选择异步可能是更经济的方法。
Oracle supports a mechanism called Multi-Version Read Consistency which is implemented by undo data in the undo segments.
Oracle支持一种称为Multi - Version Read Consistency的机制，这是用undo段中的undo数据实现的。
Oracle supports a mechanism called Multi-Version Read Consistency which is implemented by undo data in the undo segments.
Oracle支持一种称为Multi - Version Read Consistency的机制，这是用undo段中的undo数据实现的。
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