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Specifies the dynamic shared memory implementation that the server should use. Possible values are posix (for POSIX shared memory allocated using shm_open), sysv (for System V shared memory allocated via shmget), windows (for Windows shared memory), and mmap (to simulate shared memory using memory-mapped files stored in the data directory). Not all values are supported on all platforms; the first supported option is usually the default for that platform. The use of the mmap option, which is not the default on any platform, is generally discouraged because the operating system may write modified pages back to disk repeatedly, increasing system I/O load; however, it may be useful for debugging, when the pg_dynshmem directory is stored on a RAM disk, or when other shared memory facilities are not available. This parameter can only be set at server start.

英文手册覆盖始于 PostgreSQL 7.4. 来源历史与运行验证各自保留独立版本边界。

此版本暂无所选语言的定义，以下显示原始英文内容。

boot val

posix

category

Resource Usage / Memory

context

postmaster

documented

true

enumvals

posix, sysv, mmap

extra desc

未知

lang

en

max val

未知

metadata version

18

min val

未知

name

dynamic_shared_memory_type

short desc

Selects the dynamic shared memory implementation used.

source

pg-settings-source-snapshot

unit

未知

vartype

enum