On 3/12/19 7:54 PM, fuzk wrote:
> Dear Sir/Madam
>
> I got an error when I execute the following select sentence.
> Would you please solve the problem for me?
What version of Postgres?
> Thank you .
>
> Alan Fu.
>
> postgres=# \set VERBOSITY verbose
> postgres=# SELECT
> round(cast(coalesce(sum(ST_length(geography(geometry)))/1000,0) as
> NUMERIC),4)||'KM' field_value from had_link;
>
> ERROR: XX000: cannot update SecondarySnapshot during a parallel operation
> CONTEXT: SQL statement "SELECT proj4text FROM public.spatial_ref_sys
> WHERE srid = 4326 LIMIT 1"
> parallel worker
> LOCATION: GetLatestSnapshot, snapmgr.c:387
I'm guessing ST_length is not parallel safe.
What is your setting for?:
max_parallel_workers_per_gather
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com