When a user session commits (or rolls back), the session's redo information must
be flushed to the redo logfile by the LGWR background process. This event shows
the time that it takes for the LGWR to complete the write and then post the
requester. The server process performing the COMMIT or ROLLBACK waits under this
event for the write to the redo log to complete
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/22308399/viewspace-750997/ ，如需转载，请注明出处，否则将追究法律责任。
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