Re: Even if I have a lot of free space PgSQL returns "ERROR: could not extend file - No space left on device"

On 9/8/23 04:25, Nature Conservation Geovista Space wrote:
> Dear Pg-users,
>
> I am coming back to Postgres/PostGIS after a few years. I am dealing
> with a big database with a lot of geometries and too many vertices.

Postgres version?

PostGIS version?

OS and version?

Is this a physical machine or a virtual one?

Hosted or local?

'Hardware' specifications?

>
> After hours running a query to Subdivide, I get this Postgres error

How does CREATE TABLE enter into the query?

What is the query?

>
> *2023-09-08 02:11:23.745 BST [328594] postgres(at)database ERROR:
> could not extend file "base/16388/7985375.1020": No space left on device
> 2023-09-08 02:11:23.745 BST [328594] postgres(at)database HINT:  Check
> free disk space.*
>
> 2023-09-08 02:11:23.745 BST [328594] postgres(at)database  STATEMENT:
> CREATE TABLE _gaul_administrative_subdivided100 AS (
>                 SELECT *, st_subdivide(geom,100) AS geom_subdivided100
>                         FROM gaul_administrative
>         );
>
> *2023-09-08 02:15:38.251 BST [313729] LOG:  checkpoint complete:
> wrote 81956 buffers (1.6%); 0 WAL file(s) added, 0 removed, 608
> recycled; write=269.414 s, sync=0.001 s, total=269.634 s; sync
> files=1, longest=0.001 s, average=0.001 s; distance=9962549 kB,
> estimate=9980351 kB; lsn=291/BF46ABE8, redo lsn=291/A0FB7D98*
>
> It seems that it is not a problem of space.
>
> Command *df -h* returns:
>
> Filesystem      Size  Used Avail Use% Mounted on
> tmpfs           6.3G  1.1M  6.3G   1% /run
> /dev/sda        1.3T  164G  1.1T  14% /
> tmpfs            32G  3.2M   32G   1% /dev/shm
> tmpfs           5.0M     0  5.0M   0% /run/lock
> tmpfs           6.3G  4.0K  6.3G   1% /run/user/1000
>
> Command *df -ih* returns:
>
> Filesystem Inodes IUsed IFree IUse% Mounted on
> tmpfs 7.9M 724 7.9M 1% /run
> /dev/sda 80M 179K 80M 1% /
> tmpfs 7.9M 4 7.9M 1% /dev/shm
> tmpfs 7.9M 3 7.9M 1% /run/lock
> tmpfs 1.6M 28 1.6M 1% /run/user/1000
>
> I suppose it is an issue with temporary table, here my present
> configuration in *postgresql.conf*
>
> #temp_tablespaces = '' # a list of tablespace names, '' uses
> # only default tablespace
>
> #temp_file_limit = -1 # limits per-process temp file space
> # in kilobytes, or -1 for no limit
>
> What do you suggest?
>
> cheers,
>
> Enzopolo
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com