ER首先读取逻辑日志，检验日志记录是否需要复制，最后将这些信息发送给相应的参与节点。

ER works by reading the logical logs, testing if a log record needs to be replicated, and finally sending that information to the appropriate participants.

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最后，exception包包含SOAException基类。它用于记录错误条件并触发事务重试和恢复逻辑。

Finally, the exception package contains the SOAException base class, which is used to log error conditions and trigger the transaction retry and recovery logic.

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逻辑日志缓冲区是用来存储最后一次备份开始的逻辑日志记录的。

Logical-log buffer is used to store logical log records since last backup.

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