[postgis-users] Query postgis GUC variables on a new connection

[Jorge Gustavo Rocha]

Hi Paul,

Thank you for the explanation. I though that the library had to be
loaded to query its GUCs.

Best regards,

Jorge

Às 22:52 de 27/10/19, Paul Ramsey escreveu:
> Until the library loads the system doesn’t know about the GUCs. And querying the GUCs doesn’t for a library load (the system doesn’t having a binding from GUC to library). Querying a function, on the other hand, forces a load. 
> If this really annoys you, add postgis_raster.so to the ld_preload config in postgresql.conf.
> 
> P
> 
>> On Oct 27, 2019, at 10:25 AM, Jorge Gustavo Rocha <jgr at di.uminho.pt> wrote:
>>
>> Hi,
>>
>> When I connect to a database, I can not query the postgis GUC variables
>> postgis.enable_outdb_rasters or postgis.gdal_enabled_drivers.
>>
>> $ psql service=geotuga
>> psql (11.4 (Ubuntu 11.4-1.pgdg18.10+1))
>> SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits:
>> 256, compression: off)
>>
>> localhost:5432 geobox at geotuga=# show postgis.gdal_enabled_drivers;
>> ERROR:  42704: unrecognized configuration parameter
>> "postgis.gdal_enabled_drivers"
>> LOCATION:  GetConfigOptionByName, guc.c:8342
>> localhost:5432 geobox at geotuga=# show postgis.enable_outdb_rasters;
>> ERROR:  42704: unrecognized configuration parameter
>> "postgis.enable_outdb_rasters"
>> LOCATION:  GetConfigOptionByName, guc.c:8342
>> localhost:5432 geobox at geotuga=#
>>
>> But if I run ST_GDALDrivers(), afterwards the variables can be queried.
>>
>> $ psql service=geotuga
>> psql (11.4 (Ubuntu 11.4-1.pgdg18.10+1))
>> SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits:
>> 256, compression: off)
>>
>> localhost:5432 geobox at geotuga=# SELECT short_name FROM ST_GDALDrivers()
>> LIMIT 1;
>> short_name
>> ------------
>> VRT
>>
>> localhost:5432 geobox at geotuga=# show postgis.enable_outdb_rasters;
>> postgis.enable_outdb_rasters
>> ------------------------------
>> on
>>
>> localhost:5432 geobox at geotuga=# show postgis.gdal_enabled_drivers;
>> postgis.gdal_enabled_drivers
>> ------------------------------
>> ENABLE_ALL
>>
>> My question is: aren't these variables already assigned? Why only after
>> ST_GDALDrivers() call are these variables defined?
>>
>> Best regards
>>
>> Jorge Gustavo
>> -- 
>> Jorge Gustavo Rocha
>> Departamento de Informática
>> Universidade do Minho
>> 4710-057 Braga
>> Gabinete 3.29 (Piso 3)
>> Tel: +351 253604480
>> Fax: +351 253604471
>> Móvel: +351 910333888
>> skype: nabocudnosor
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users at lists.osgeo.org
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> 
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> 

J. Gustavo
-- 
Jorge Gustavo Rocha
Departamento de Informática
Universidade do Minho
4710-057 Braga
Gabinete 3.29 (Piso 3)
Tel: +351 253604480
Fax: +351 253604471
Móvel: +351 910333888
skype: nabocudnosor