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 System Architecture  |  Question 17 of 33    Print  
What Does DBWR do ?
Database  writer  writes  modified blocks from the database buffer cache to the data files.



  
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DBWR - Database Writer.LGWR - Log WriterCKPT - Check PointSMON - System MonitorPMON - Process MonitorARCH - ArchiverRECO - RecoverDnnn - Dispatcher, andLCKn - LockSnnn - Server. 
Latest Answer : Mandatory Processes DBWR - Database Writer.LGWR - Log WriterCKPT - Check PointSMON - System MonitorPMON - Process Monitor Optional Process ARCH - ArchiverRECO - RecoverDnnn - Dispatcher, andLCKn - LockSnnn - Server. ...

Database  writer  writes  modified blocks from the database buffer cache to the data files. 

DBWR  writes  when  more  data  needs  to  be read into the SGA and too few database  buffers  are free. The least recently used data is written to the data 
Latest Answer : DBWR writes* when checkpoint occures* when dirty buffers reach threshold* when RAC ping requested* when free buffers are not available* when tablespace taken offline,droped ...

The Checkpoint (CKPT) process is responsible for signaling  DBWR  at checkpoints  and updating all the data files and control 
Latest Answer : Ckpt (checkpoint) is a background process. It synchronize SCN of all the database files like datafiles, control files and redo log files. ...


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