SYSTEM VIEW · 系统视图

pg_shmem_allocations

The pg_shmem_allocations view shows allocations made from the server's main shared memory segment. This includes both memory allocated by PostgreSQL itself and memory allocated by extensions using the mechanisms detailed in Section 36.10.11. Note that this view does not include memory allocated using the dynamic shared memory infrastructure.

首次收录 PG 13最近收录 PG 19当前字段 4

9.0 9.1 9.2 9.3 9.4 9.5 9.6 10 11 12 13 14 15 16 17 18 19^β3

已与 PostgreSQL 18.6 实例逐字段核对 · 原始实测记录 ↗

字段结构 PostgreSQL 18

pg_shmem_allocations

字段 / COLUMN	类型 / TYPE	说明 / DESCRIPTION
`name`	`text`	The name of the shared memory allocation. NULL for unused memory and <anonymous> for anonymous allocations.
`off`	`bigint`文档原写法：`int8`	The offset at which the allocation starts. NULL for anonymous allocations, since details related to them are not known.
`size`	`bigint`文档原写法：`int8`	Size of the allocation in bytes
`allocated_size`	`bigint`文档原写法：`int8`	Size of the allocation in bytes including padding. For anonymous allocations, no information about padding is available, so the size and allocated_size columns will always be equal. Padding is not meaningful for free memory, so the columns will be equal in that case also.

标记“隐式列”的字段不包含在 SELECT * 中；部分早期统计视图由同版本源码补全，额外来源会显示在字段说明中。

字段演化矩阵

悬停查看字段类型

存在新增 / 类型或属性变化移除

字段 / COLUMN	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12
`name`	–	–	–	–	–	–	–	–	–	–
`off`	–	–	–	–	–	–	–	–	–	–
`size`	–	–	–	–	–	–	–	–	–	–
`allocated_size`	–	–	–	–	–	–	–	–	–	–

9.0 是收录基线；基线中已存在的字段不标记为新增。矩阵按字段名称对齐，重命名显示为旧字段移除与新字段新增。

演化时间线

相邻大版本的变化

PostgreSQL 18 ← 17

目录说明更新

PostgreSQL 17 ← 16

目录说明更新

PostgreSQL 16 ← 15

2 处字段说明更新

PostgreSQL 15 ← 14

目录说明更新

PostgreSQL 14 ← 13

目录说明更新

PostgreSQL 13 ← 12新增目录

+ name+ off+ size+ allocated_size

比较任意两个版本

起始版本 / FROM目标版本 / TO包含描述更新

选择两个版本，查看字段的新增、移除与类型变化。交互比较需要 JavaScript；演化时间线可直接阅读。