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    How to define kernel.shmmax on Linux

    • Article Type: General
    • Product: Aleph
    • Product Version: 20

    Desired Outcome Goal:
    Define the right value for shmmax kernel parameter

    1. For SHMMAX parameter on 64-bit (x86-64) Linux system, Oracle Global Customer Support officially recommends a "maximum" of "1/2 of physical RAM".

    2. Check the kernel value actually in use with
    /sbin/sysctl -A | grep shm

    3. Check the physical ram memory with
    cat /proc/meminfo

    Category: System Management (500)

    Subject: Oracle (500)

    • Article last edited: 10/8/2013