The redo log buffer is one-third full or contains 1 MB of buffered data.

在重做日志记录达到缓冲区的三分之一。

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Unless the redo log buffer is particularly full, only one synchronous writes is required per transaction. if piggybacking occurs, there can be less than one synchronous write per transaction.

除非重做日志缓冲区特别满，否则每个事务处理只需要一个同步写入。

youdao

If the redo log buffer fills, or another transaction commits, LGWR flushes all of the redo log entries in the redo log buffer to a redo log file, even though some redo records may not be committed.

例如如果重做日志缓冲满了，或者有其它的事务提交了。LGWR进程会把所有在重做日志缓冲中的重做日志事项写入重做文件，即使是一些重做记录可能还没有提交。

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