由DAO所执行的每一个操作——如创建、更新或者删除数据——都与一个事务相关联。

Each operation performed by a DAO — such as creating, updating, or deleting data — is associated with a transaction.

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第2阶段，提交：如果所有的资源都准备就绪，则全部进行提交——在旧数据删除且事务不再回滚之后进行。

Phase 2, commit: If all of the resources are ready, they all commit — after which the old data is deleted and the transaction can no longer roll back.

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下一个例子显示了如何删除stores_demo数据库中的customer表，以演示是否会在RS次要服务器上立即应用以下事务。

The next example shows dropping the customer table in the stores_demo database to demonstrate whether the following transaction will be applied immediately at RS secondary.

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