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Default database writer processes tips 

Oracle Tips by Burleson Consulting
June 6, 2009


Question:
  What is the default number of database writers for a Oracle 10g Database?

Answer:  Starting with Oracle 8.0.5, Oracle supports true multiple DBWR processes, with no master/slave relationships. This db_writer_processes parameter requires that the database server support asynchronous I/O. 

Setting db_writer_processes to a non -default value is is useful for systems that modify data heavily. It specifies the initial number of database writer processes for an instance.

The default for db_writer_processes is 1 or (CPU_COUNT / 8), whichever is greater.

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