Oracle Backgroup Processes

Pmon:process Monitor uses automatic registration for dynamic monitoring to handle abnormal processes.
Smon:system Monitor is used for instance recovery.
LCKN: Use only the RAC database for blocking between instance.
RECO: For the recovery of distributed databases, the full name is distributed database Recovery.
The Ckpt:check point is controlled by the Oracle Fast_start_mttr_target parameter, which triggers the DBWR to write dirty data from buffer cache to the data files on disk. The header information and control file information of the file are also written.
DBWR: Writes dirty data from buffer cache to data files on disk. It will certainly inform LGWR to write the database to online redo log files before it is written.
LGWR: Write the database in log buffer to the online redo log files.
When to trigger LGWR:
1, 3 seconds at a time
When the 2,commit
3, when the log buffer data reaches 1M
4,log Buffer 1/3 when it's full.
5, when the online log switch
ARCH: Archive online redo log files, which occurs when the log is switched.