Operating System-Dependent Parameters

The valid values or value ranges of some initialization parameters depend upon the host operating system. For example, the parameter DB_BLOCK_BUFFERS indicates the number of data buffers in main memory, and its maximum value depends on the operating system. The size of those buffers, set by DB_BLOCK_SIZE, has an operating system-dependent default value.

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Your operating system-specific Oracle documentation for more information on operating system-dependent Oracle parameters and operating system parameters