Shulou(Shulou.com)06/01 Report--

LGWR trigger condition: logs are always written to disk before data is written

The LGWR process is triggered to write logs from the log buffer to the log file under the following conditions:

(1) user submission (commit)

(2) there are 1 ram 3 log buffers that are not written to disk

(3) every 3 seconds

(4) there are redo log buffers larger than 1m that are not written to disk

The SCN of the data that DBWR needs to write is greater than the SCN recorded by LGWR. DBWR triggers LGWR write, and the log is always written to disk before the data is written to disk. Ensure the SCN number of LGWR, the SCN number of ≥ DBWR.

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