Wiki / Configuration Parameters

Specifies the shared memory implementation that the server should use for the main shared memory region that holds PostgreSQL's shared buffers and other shared data. Possible values are mmap (for anonymous shared memory allocated using mmap), sysv (for System V shared memory allocated via shmget) and windows (for Windows shared memory). Not all values are supported on all platforms; the first supported option is the default for that platform. The use of the sysv option, which is not the default on any platform, is generally discouraged because it typically requires non-default kernel settings to allow for large allocations (see Section 18.4.1). This parameter can only be set at server start.

English manual coverage begins with PostgreSQL 7.4. Source history and runtime observations have their own recorded version boundaries.

boot val

mmap

category

Resource Usage / Memory

context

postmaster

documented

true

enumvals

sysv, mmap

extra desc

Unknown

lang

en

max val

Unknown

metadata version

18

min val

Unknown

name

shared_memory_type

short desc

Selects the shared memory implementation used for the main shared memory region.

source

pg-settings-source-snapshot

unit

Unknown

vartype

enum