嵌套事务(Nested Transaction)： 指在一个Parent事务中嵌套的一个或多个Sub Transaction.并且主事务与其相互影响，这种事务就称为嵌套事务。
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Trigger execution models include Multiple tigger model and nested transaction model.
触发器的执行模型包括多触发器模型和嵌套事务模型。
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触发器的执行模型包括多触发器模型和嵌套事务模型。
Trigger execution models include Multiple tigger model and nested transaction model.
主动实时嵌套事务的正确性比传统的原子事务更复杂。
The correctness for an active realtime transaction is much more complex than that for a traditional atomic transaction.
该发布中有很多Active Record更新，包括嵌套事务的引入。
There are many Active Record updates in this release including the introduction of nested transactions.
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