Shared memory is configured on the disk or physical RAM?

Version: 11.2

Platform: RHEL 6

On Linux, we have put the following into /etc/sysctl.conf to set up shared memory.

# 61 gb shared memory configuration

kernel.shmmax = 65719476736

Where this 61 GB of memory is allocated? The physical RAM or disk?

Shared memory will be allocated RAM and may be subject to be paged out (written to disk).

However, you should use huge pages, which are not subject to the paging or swapping.  (The value vm.nr_hugepages dans/etc/sysctl.conf.)

In addition, setting kernel.shmmax allocates exactly zero bytes of shared memory.

shmmax is the upper limit of the size of a single shared memory segment.  It is not actually assign * nothing *, though.

He also, does * not * set a limit on the total amount shared memory that can be affected.  That is controlled by shmall.

Hope that helps,

-Mark

Tags: Database

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