What is Database Writer (DBWR) and when does DBWR write to the data file?

DBWR is a background process that writes data blocks information from Database buffer cache to datafiles.

There are seven important situations when DBWR writes to data file:

  1. Every 3 seconds.
  2. Whenever a checkpoint occurs.
  3. When server process needs free space in database buffer cache to read new blocks.
  4. Whenever some blocks reaches a maximum value.
  5. Timeout occurs.
  6. RAC ping request is made.
  7. When any tablespace is taken offline, read only, drop or truncated & when to begin the backup.
CaseyErura said: (Fri, Sep 22 2017 06:49:13 PM)

<a >More info!..</a>
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ViboRhima said: (Thu, Oct 5 2017 01:45:23 AM)

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<a >i have a lump under my armpit</a>
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Alert me