log file sync: 日志文件同步 log file sync 必须等待这一过程成功完成(Oracle 通过写redo log file 保证commit 成功的数据不丢失)，这个事件说明提交可能过于频繁，批量提交...
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CPU负荷增长尽管(写)事务量没有变写日志个数没有变日志文件同步的往返信号传输时间就会延长。
When the CPU load goes up, the time taken for a log file sync round trip can increase even when the number of log file syncs and the volume of redo log generated doesn't change.
结果就是队列文件的备份与日志文件的备份存在些许的不同步现象，可能会有一个或多个文件被破坏。
This results in the backup of the queue files being slightly out of sync from the backup of the log files, and the possibility that one or more of the files will be corrupted.
为了在备用服务器上保持数据库的一个同步副本，系统会一致地将DB 2 HADR日志文件从主要服务器发送到备用服务器来保持二者的同步。
To keep a synchronized copy of the database on the standby server, DB2 HADR log files are consistently sent from the primary to the standby to keep the two in sync.
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