此信息被复制用于确认日志记录是否被处理过。
This information can be used by replication to determine whether a log record has been processed or not.
在确认日志不处于严重级别之后，通过移除常规、重复的日志记录来降噪。
Minimize "noise" by removing routine, repetitive log entries from view after confirming that they are benign.
备用系统收到日志写后，将确认通知发送到主系统。
Once the standby system receives the log write, it sends acknowledgements to the primary.
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