Oracle安装 - shmmax和shmall设置

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一、概述

在Linux上安装oracle，需要对内核参数进行调整，其中有shmmax和shmall这两个参数，那这两个参数是什么意思，又该如何设置呢？

二、官方文档

在oracle的官方文档（ https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/minimum-parameter-settings-for-installation.html#GUID-CDEB89D1-4D48-41D9-9AC2-6AD9B0E944E3 ）中对这两个参数，设置了最小的标准值。

shmall - Greater than or equal to the value of shmmax, in pages.
shmmax - Half the size of physical memory in bytes. See My Oracle Support Note 567506.1 for additional information about configuring shmmax.

再根据redhat的官方文档（ https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/performance_tuning_guide/sect-red_hat_enterprise_linux-performance_tuning_guide-configuration_tools-configuring_system_memory_capacity ），去查这两个参数所表达的含义。

shmall - Defines the total amount of shared memory pages that can be used on the system at one time. A page is 4096