PostgreSQL 18 ← 17新增目录
← 目录图谱 / pg_shmem_allocations_numa
SYSTEM VIEW · 系统视图
pg_shmem_allocations_numa
The pg_shmem_allocations_numa shows how shared memory allocations in the server's main shared memory segment are distributed across NUMA nodes. This includes both memory allocated by PostgreSQL itself and memory allocated by extensions using the mechanisms detailed in Section 36.10.11. This view will output multiple rows for each of the shared memory segments provided that they are spread across multiple NUMA nodes. This view should not be queried by monitoring systems as it is very slow and may end up allocating shared memory in case it was not used earlier. Current limitation for this view is that won't show anonymous shared memory allocations. Note that this view does not include memory allocated using the dynamic shared memory infrastructure.
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_numaPostgreSQL 19 beta 3 是预发布快照，结构在正式发布前仍可能变化。
| 字段 / COLUMN | 类型 / TYPE | 说明 / DESCRIPTION |
|---|---|---|
name |
text |
The name of the shared memory allocation. |
numa_node |
integer文档原写法：int4 |
ID of NUMA node |
size |
bigint文档原写法：int8 |
Size of the allocation on this particular NUMA memory node in bytes |
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。
通用系统列 0
PostgreSQL 提供的系统属性，通常不在 SELECT * 中展开。单独保留，不与普通字段混算。
| 字段 | 类型 | attnum |
|---|
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 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
name |
– | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
numa_node |
– | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
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
相邻大版本的变化比较任意两个版本
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。