PostgreSQL 18 ← 17Catalog added
← Catalog atlas / pg_shmem_allocations_numa
SYSTEM VIEW · System view
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.
Checked column by column against a PostgreSQL 18.6 instance · Raw measurement record ↗
Columns PostgreSQL 18
pg_shmem_allocations_numaPostgreSQL 19 beta 3 is a preview snapshot; the structure can still change before release.
| COLUMN | TYPE | DESCRIPTION |
|---|---|---|
name |
text |
The name of the shared memory allocation. |
numa_node |
integerDocumented as:int4 |
ID of NUMA node |
size |
bigintDocumented as:int8 |
Size of the allocation on this particular NUMA memory node in bytes |
Columns marked "implicit" are not included in SELECT *; some early statistics views are completed from same-version source, and the extra provenance is shown in the column description.
Common system columns 0
System attributes PostgreSQL provides, normally not expanded by SELECT *. Kept separately so they are not mixed in with ordinary columns.
| Columns | Type | attnum |
|---|
Column evolution matrix
Hover a cell for the column typePresentAdded / type or attribute changeRemoved
| 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 is the coverage baseline; a column already present in the baseline is not marked as added. The matrix aligns columns by name, so a rename appears as the old column removed and a new column added.
Evolution timeline
Changes between adjacent majorsCompare any two versions
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