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Oracle® Database Reference
11g Release 2 (11.2)

Part Number E17110-04
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Property Description
Parameter type Integer
Default value 1 or CPU_COUNT / 8, whichever is greater. If the number of processor groups is less than 36 but greater than the number of DB writer processes, then the number of DB writer processes is adjusted to be a multiple of the number of processor groups. If the number of DB writer processes is greater than or equal to the number of processor groups, then there is no adjustment.
Modifiable No
Range of values 1 to 36
Basic No

DB_WRITER_PROCESSES specifies the initial number of database writer processes (DBW0, ... DBW9 and DBWa, ... DBWz) for an instance. This parameter is useful for systems that modify data heavily.

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